Mental Math

1
Mental Math
Set 3
2
Mental Math 1

1. 6700 208
2. 3000 700 220
3. 10.3 5.7 4.2
4. 10.9 3.5
5. You give 20 for a purchase costing 4.30 What is
   your change?
6. 550 150 ? 1000
7. The sum of two cubed and two squared
8. 726 ? 6
9. 11.5 x 100
10. 51.37 ? 10

3
Mental Math 1

1. 6700 208 6908
2. 3000 700 220 3920
3. 10.3 5.7 4.2 20.2
4. 10.9 3.5 7.4
5. You give 20 for a purchase costing 4.30 What is
   your change? 15.70
6. 550 150 300 1000
7. The sum of two cubed and two squared 12
8. 726 ? 6 121
9. 11.5 x 100 1150
10. 51.37 ? 10 5.137

4
Mental Math 2

1. Which is larger 4 or -7
2. 3 -5
3. 100.5 20.1
4. 8.4 3.1
5. You give 100 for a purchase costing 65.00 What
   is your change?
6. 70 500 ? 1000
7. 3100 x 10
8. 805 ? 5
9. 5.3 x 100
10. 1.3 ? 10

5
Mental Math 2

1. Which is larger 4 or -7 -4
2. 3 -5 -2
3. 100.5 20.1 120.6
4. 8.4 3.1 5.3
5. You give 100 for a purchase costing 65.00 What
   is your change? 35.00
6. 70 500 430 1000
7. 3100 x 10 31 000
8. 805 ? 5 161
9. 5.3 x 100 530
10. 1.3 ? 10 0.13

6
Mental Math 3

• 1)
• 2)
• 3)
• 4)
• 5)
• 6)
• 7)
• 8)
• 9)
• 10)

7
Mental Math 3

• 1) -1
• 2) -2
• 3) 2
• 4) 0
• 5) -1
• 6) 0
• 7) 3
• 8) -1
• 9) -6
• 10) -1

8
Mental Math 4

1. (-5) (-3)
2. (8) (-2)
3. (-2) (-4)
4. (-5) (10)
5. You owe you friend 20. You earn 15 babysitting.
   What is your net worth?
6. (50) - (-10)
7. (-5) (3)
8. -2 - -6
9. 575 ? 5
10. -2 - 10

9
Mental Math 4

1. (-5) (-3) -8
2. (8) (-2) 6
3. (-2) (-4) -6
4. (-5) (10) 5
5. You owe you friend 20. You earn 15 babysitting.
   What is your net worth? -5
6. (50) - (-10) 60
7. (-5) (3) -2
8. -2 - -6 4
9. 575 ? 5 115
10. -2 - 10 -12

10
Mental Math 5

1. (-6) (-3)
2. (8) (-2)
3. (-2) - (-4)
4. (5) x (-10)
5. You owe you friend 20. You earn 8. What is your
   net worth?
6. (50) - (-10)
7. (-5) (3)
8. -20 x -60
9. 555 ? -5
10. 2 groups of -10

11
Mental Math 5

1. (-6) (-3) -9
2. (8) (-2) 6
3. (-2) - (-4) 2
4. (5) x (-10) -50
5. You owe you friend 20. You earn 8. What is your
   net worth? -12
6. (50) - (-10) 60
7. (-5) (3) -2
8. -20 x -60 1200
9. 555 ? -5 -111
10. 2 groups of -10 -20

12
Mental Math 6

1. (-2) (7)
2. (-8) - (-5)
3. (-5) - (-10)
4. (-6) x (-5)
5. You have 50. You earn 20 babysitting. You
   purchase two tickets for a concert costing 10
   each. What is your net worth?
6. Negative 10 squared
7. (5) (-3)
8. 500 x -7
9. -448 ? -2
10. Yesterday we earn 230 selling cotton candy.
    Last night we earned 150. Our expenses so far is
    20. What is our net profit.

13
Mental Math 6

1. (-2) (7) 5
2. (-8) - (-5) -3
3. (-5) - (-10) 5
4. (-6) x (-5) 30
5. You have 50. You earn 20 babysitting. You
   purchase two tickets for a concert costing 10
   each. What is your net worth? 50
6. Negative 10 squared 100
7. (5) (-3) 2
8. 500 x -7 -3500
9. -448 ? -2 224
10. Yesterday we earn 230 selling cotton candy.
    Last night we earned 150. Our expenses so far is
    20. What is our net profit. 360

14
Mental Math 7

• (-12) - (3)
• (-2) - (-5)
• (-5) (-10)
• 4 -5
• You owe 60. You earn 5 an hour babysitting. You
  baby-sit for 5 hours. What is your net worth?
• -23
• (5) . (-3)
• -10 x 10 x 10 x -10
• -4 ? -1
• -60
• 3

15
Mental Math 7

• (-12) - (3) -15
• (-2) - (-5) 3
• (-5) (-10) 50
• 4 -5 -1
• You owe 60. You earn 5 an hour babysitting. You
  baby-sit for 5 hours. What is your net worth?
  -35
• -23 -8
• (5) . (-3) -15
• -10 x 10 x 10 x -10 10 000
• -4 3 -1
• -60 -20
• 3

16
Mental Math 8

1. 3.1 x 102
2. (-5) (1)
3. 10.5 20.5 0.6
4. (5) (-4)
5. You give 100 for a purchase costing 90.90 What
   is your change?
6. 7 x 100 5 x 10 3 x 1
7. (-3) (-2)
8. 729 ? 3
9. 52
10. (-3) (-5)

17
Mental Math 8

1. 3.1 x 102 310
2. (-5) (1) -4
3. 10.5 20.5 0.6 31.6
4. (5) (-4) 1
5. You give 100 for a purchase costing 90.90 What
   is your change? 9.10
6. 7 x 100 5 x 10 3 x 1 753
7. (-3) (-2) -5
8. 729 ? 3 243
9. 52 25
10. (-3) (-5) 2

18
Mental Math 9

1. 2.3 x 102
2. 3 -2
3. 50
4. 9 40.3 0.5
5. 10.00 - 6.75
6. 345 000 in scientific notation
7. (-4) (4)
8. 255 ? 5
9. 4.2 x 1000
10. 23

19
Mental Math 9

1. 2.3 x 102 230
2. 3 -2 1
3. 50 1
4. 9 40.3 0.5 49.8
5. 10.00 - 6.75 3.25
6. 345 000 in scientific notation 3.45 x 105
7. (-4) (4) 0
8. 255 ? 5 51
9. 4.2 x 1000 4200
10. 23 8

20
Mental Math 10

1. Double 3000
2. 3 x 1000 5 x 100
3. 7.1 8.8 1.2
4. You spend 5.48. You have 10.00. What is your
   change?
5. 100.00 432.90
6. 670 ? 1000
7. 542 x 100
8. Three cubed
9. 844 ? 4
10. 81 groups of 102

21
Mental Math 10

1. Double 3000 6000
2. 3 x 1000 5 x 100 3500
3. 7.1 8.8 1.2 17.1
4. You spend 5.48. You have 10.00. What is your
   change? 4.52
5. 100.00 432.90 532.90
6. 670 330 1000
7. 542 x 100 54200
8. Three cubed 27
9. 844 ? 4 211
10. 81 groups of 102 8100

22
Mental Math 11

1. Double 2000 and add 300
2. 6 x 102 3 x 100
3. 8.1 2.9 4.2
4. You spend 5.70 You have 10.00. What is your
   change?
5. Half of 400 minus 10
6. Multiple 9 groups of 50
7. 62 x 100
8. Four squared
9. 784 ? 100
10. 3.2 x 103

23
Mental Math 11

1. Double 2000 and add 300 4300
2. 6 x 102 3 x 100 603
3. 8.1 2.9 4.2 15.2
4. You spend 5.70 You have 10.00. What is your
   change? 4.30
5. Half of 400 minus 10 190
6. Multiple 9 groups of 50 450
7. 62 x 100 6200
8. Four squared 16
9. 784 ? 100 7.84
10. 3.2 x 103 3200

24
Mental Math 12

1. lt A is a ___ angle
2. lts B are ___ angles
3. lt C is a ___ angle
4. lt D is a ___ angle
5. lt E is a ___ angle
6. lts F are ___ angles
7. lt G is a ___ angle
8. Measure of lt A is ___
9. Measure of lt G is ___
10. Measure of lt C is most likely 850, 1050, 1350 or
    1750?

B
A
B
D
C
E
F
F
G
25
Mental Math 12

1. lt A is a right angle
2. lts B are complementary angle
3. lt C is an obtuse angle
4. lt D is an obtuse angle
5. lt E is an acute angle
6. lts F are supplementary angles
7. lt G is a straight angle
8. Measure of lt A is 900
9. Measure of lt G is 1800
10. Measure of lt C is most likely 850, 1050, 1350 or
    1750?

B
A
B
D
C
E
F
F
G
26
Mental Math 13

1. The complement to a 600 angle
2. The complement to a 250 angle
3. The supplement to a 1000 angle
4. The supplement to a 1600 angle
5. The supplement to a 500 angle
6. The complement to a 720 angle
7. The complement to a 550 angle
8. The supplement to a 700 angle
9. The supplement to a 400 angle
10. The reflex angle to a 700 angle

27
Mental Math 13

1. The complement to a 600 angle 300
2. The complement to a 250 angle 650
3. The supplement to a 1000 angle 800
4. The supplement to a 1600 angle 200
5. The supplement to a 500 angle 1300
6. The complement to a 720 angle 180
7. The complement to a 550 angle 350
8. The supplement to a 700 angle 1100
9. The supplement to a 400 angle 1400
10. The reflex angle to a 700 angle 2900

28
Mental Math 14

• The complement to a 750 angle
• The complement to a 290 angle
• The supplement to a 1520 angle
• The supplement to a 1250 angle
• The opposite angle to a 500 angle
• The reflex angle to a 500 angle
• The reflex angle to a 1200 angle
• The measure of angle a
• The measure of angle b
• The measure of angle c

a
b
c
29
Mental Math 14

• The complement to a 750 angle 150
• The complement to a 290 angle 610
• The supplement to a 1520 angle 280
• The supplement to a 1250 angle 550
• The opposite angle to a 500 angle 500
• The reflex angle to a 500 angle 3100
• The reflex angle to a 1200 angle 2400
• The measure of angle a 450
• The measure of angle b 900
• The measure of angle c 450

a
b
c
30
Mental Math 15

1. The m lt a
2. The m lt b
3. The m lt c
4. The m lt d
5. The m lt e
6. The m lt f
7. The m lt g
8. The m lt h
9. The m lt i
10. The m lt j

j
a
30o
70o
g
c
b
i
d
h
e
f
31
Mental Math 15

1. The m lt a 1500
2. The m lt b 300
3. The m lt c 1500
4. The m lt d 300
5. The m lt e 1500
6. The m lt f 300
7. The m lt g 700
8. The m lt h 700
9. The m lt i 800
10. The m lt j 1100

j
a
30o
70o
g
c
b
i
d
h
e
f
32
Mental Math 16

1. The m lt a
2. The m lt b
3. The m lt c
4. The m lt d
5. The m lt e
6. The m lt f
7. The m lt g
8. The m lt h
9. The m lt i
10. The m lt j

a
120o
b
c
j
d
h
80o
e
i
f
g
33
Mental Math 16

1. The m lt a 600
2. The m lt b 1200
3. The m lt c 600
4. The m lt d 1000
5. The m lt e 1000
6. The m lt f 800
7. The m lt g 800
8. The m lt h 400
9. The m lt i 400
10. The m lt j 1400

a
120o
b
c
j
d
h
80o
e
i
f
g
34
Mental Math 17

1. If m lta is 200, then ltc
2. If m ltd is 1200, then ltc
3. If m lte is 1150, then ltf
4. If m ltj is 1500, then lth
5. If m ltb and lt f are 600, then ltg
6. If m lth is 1230, then lti
7. If m ltf and ltg are 500, then ltb
8. If m lti is 320, then lth
9. If m ltg is 750, then ltj
10. If m ltf and ltg are 600, then ltc

a
d
c
b
e
g
f
h
i
j
35
Mental Math 17

1. If m lta is 200, then ltc 1600
2. If m ltd is 1200, then ltc 1200
3. If m lte is 1150, then ltf 650
4. If m ltj is 1500, then lth 1500
5. If m ltb and lt f are 600, then ltg 600
6. If m lth is 1230, then lti 570
7. If m ltf and ltg are 500, then ltb 800
8. If m lti is 320, then lth 1480
9. If m ltg is 750, then ltj 1050
10. If m ltf and ltg are 600, then ltc 1200

a
d
c
b
e
g
f
h
i
j
36
Mental Math 18

1. The m lt a
2. The m lt b
3. The m lt c
4. The m lt d
5. The m lt e
6. The m lt f
7. The m lt g
8. The m lt h
9. The m lt i
10. The m lt j

d
b
c
a
20o
30o
j
e
f
g
i
h
37
Mental Math 18

1. The m lt a 1300
2. The m lt b 1300
3. The m lt c 200
4. The m lt d 300
5. The m lt e 200
6. The m lt f 1600
7. The m lt g 1600
8. The m lt h 1500
9. The m lt i 300
10. The m lt j 300

d
b
c
a
20o
30o
j
e
f
g
i
h
38
Mental Math 19

1. The m lt a
2. The m lt b
3. The m lt c
4. The m lt d
5. The m lt e
6. The m lt f
7. The m lt g
8. The m lt h
9. The m lt i
10. The m lt j

e
d
c
b
70o
a
j
h
g
i
50o
f
39
Mental Math 19

1. The m lt a 1300
2. The m lt b 500
3. The m lt c 600
4. The m lt d 600
5. The m lt e 700
6. The m lt f 400
7. The m lt g 900
8. The m lt h 600
9. The m lt i 600
10. The m lt j 1200

e
d
c
b
70o
a
j
h
g
i
50o
f
40
Mental Math 20

1. The m lt a
2. The m lt b
3. The m lt c
4. The m lt d
5. The m lt e
6. The m lt f
7. The m lt g
8. The m lt h
9. The m lt i
10. The m lt j

e
d
b
c
a
60o
g
j
h
50o
i
f
41
Mental Math 20

1. The m lt a 500
2. The m lt b 500
3. The m lt c 700
4. The m lt d 700
5. The m lt e 600
6. The m lt f 400
7. The m lt g 1300
8. The m lt h 700
9. The m lt i 700
10. The m lt j 1100

e
d
b
c
a
60o
g
j
h
50o
i
f
42
Mental Math 21

1. 3000 705 20
2. 9000 20 70
3. 4.1 3.6 1.9
4. 1000 230
5. 100.00 - 9.90
6. 180 ? 500
7. 500 x 20
8. 5 x 101
9. 10 x 27.3
10. 590.1 ? 102

43
Mental Math 21

1. 3000 705 20 3725
2. 9000 20 70 9090
3. 4.1 3.6 1.9 9.6
4. 1000 230 770
5. 100.00 - 9.90 90.10
6. 180 320 500
7. 500 x 20 10 000
8. 5 x 101 50
9. 10 x 27.3 273
10. 590.1 ? 102 5.901

44
Mental Math 22

1. Double 650
2. 6 x 1000 3 x 100 2 x 1
3. 5.3 2.9 5.7
4. You spend 3.25 You have 10.00. What is your
   change?
5. Half of 450
6. Multiple 40 groups of 60
7. 6.5 x 100
8. Two squared added to three squared
9. 6366 ? 3
10. 3 groups of 103

45
Mental Math 22

1. Double 650 1300
2. 6 x 1000 3 x 100 2 x 1 6302
3. 5.3 2.9 5.7 13.9
4. You spend 3.25 You have 10.00. What is your
   change? 6.75
5. Half of 450 225
6. Multiple 40 groups of 60 2400
7. 6.5 x 100 650
8. Two squared added to three squared 13
9. 6366 ? 3 2122
10. 3 groups of 103 3000

46
Mental Math 23

1. Double the sum of 100 and 150
2. 7 x 103 8 x 101
3. 10.8 - 3.4
4. You spend 69.90 You have 100.00. What is your
   change?
5. 50 20 000 300
6. Multiple 100 groups of 3.5
7. The quotient of 35 and 5
8. Two cubed
9. 900 ? 102
10. 8 x 103

47
Mental Math 23

1. Double the sum of 100 and 150 500
2. 7 x 103 8 x 101 7080
3. 10.8 - 3.4 7.4
4. You spend 69.90 You have 100.00. What is your
   change? 30.10
5. 50 20 000 300 20 350
6. Multiple 100 groups of 3.5 350
7. The quotient of 35 and 5 7
8. Two cubed 8
9. 900 ? 102 9
10. 8 x 103 8000

48
Mental Math 24

1. The difference of 70 and 50 times 2
2. 6 x 103 2 x 100
3. 21.9 7.5
4. You spend 25.25 You have 100.00. What is your
   change?
5. 6000 70 000 49
6. Multiple 100 groups of 47
7. The quotient of 50 and 10
8. Nine squared
9. 760 ? 102
10. 5 x 103

49
Mental Math 24

• The difference of 70 and 50 times 2 40
• 6 x 103 2 x 100 6002
• 21.9 7.5 29.4
• You spend 25.25 You have 100.00
• What is your change? 74.75
• 5) 6000 70 000 49 76 049
• 6) Multiple 100 groups of 47 4700
• 7) The quotient of 50 and 10 5
• 8) Nine squared 81
• 9) 760 ? 102 7.6
• 10) 5 x 103 5000

50
Mental Math 25

1. The product of 60 and 5 added to 49
2. 50 x 102
3. 250 350 391
4. You spend 79.45 You have 100.00. What is your
   change?
5. 200 900 000 4000 63
6. Multiple 1000 groups of 2.3
7. The quotient of 555 and 5
8. Six squared, minus ten
9. 570 ? 100
10. 5 x 103 9 x 101

51
Mental Math 25

1. The product of 60 and 5 added to 49 349
2. 50 x 102 5000
3. 250 350 391 991
4. You spend 79.45 You have 100.00. What is your
   change? 20.55
5. 200 900 000 4000 63 904 263
6. Multiple 1000 groups of 2.3 2300
7. The quotient of 555 and 5 111
8. Six squared, minus ten 26
9. 570 ? 100 570
10. 5 x 103 9 x 101 5090

52
Mental Math 26

1. The difference of 400 and 200 multiplied by 4
2. On Saturday we collected 1028.95 worth of
   bottles and received 32.00 in donations. Are
   total profit
3. 400 300 342
4. You spend 29.52 You have 100.00. What is your
   change?
5. 600 7000 40 000 79
6. Multiple 100 groups of 4.53
7. The quotient of 372 and 3
8. four squared, added to twenty
9. 451 ? 100
10. 2 x 102 9 x 101

53
Mental Math 26

1. The difference of 400 and 200 multiplied by 4
   800
2. On Saturday we collected 1028.95 worth of
   bottles and received 32.00 in donations. Are
   total profit 1060.95
3. 400 300 342 1042
4. You spend 29.52 You have 100.00. What is your
   change? 70.48
5. 600 7000 40 000 79 47 679
6. Multiple 100 groups of 4.53 453
7. The quotient of 372 and 3 124
8. four squared, added to twenty 36
9. 451 ? 100 451
10. 2 x 102 9 x 101 290

54
Mental Math 27

1. Double 320
2. 6 x 1000 3 x 100 2 x 1
3. 2.1 2.9 5.7
4. You spend 3.89 You have 10.00. What is your
   change?
5. Half of 660
6. Multiple 300 groups of 6
7. 6.5 x 100
8. Two squared added to ten squared
9. 6339 ? 3
10. 6 groups of 103

55
Mental Math 27

1. Double 320 640
2. 6 x 1000 3 x 100 2 x 1 6302
3. 2.1 2.9 5.7 10.7
4. You spend 3.89 You have 10.00. What is your
   change? 6.11
5. Half of 660 330
6. Multiple 300 groups of 6 1800
7. 6.5 x 100 650
8. Two squared added to ten squared 104
9. 6339 ? 3 2113
10. 6 groups of 103 6000

56
Mental Math 28

1. Double 700
2. 63 000 in scientific notation
3. 100.5 100.5 100.5
4. You spend 5.65 You have 10.00. What is your
   change?
5. Half of 2010
6. Multiple 5 groups of 700
7. 0.56 x 100
8. The difference of ten squared and five squared
9. 575 ? 5
10. 2 groups of 103

57
Mental Math 28

1. Double 700 1400
2. 63 000 in scientific notation 6.3 x 104
3. 100.5 100.5 100.5 301.5
4. You spend 5.65 You have 10.00. What is your
   change? 4.35
5. Half of 2010 1005
6. Multiple 5 groups of 700 3500
7. 0.56 x 100 56
8. The difference of ten squared and five squared
   75
9. 575 ? 5 115
10. 2 groups of 103 2000

58
Mental Math 29

1. Double 2000 added to 342
2. 780 000 in scientific notation
3. 100.3 x 2
4. You spend 50.90 You have 100.00. What is your
   change?
5. Half of 612
6. Multiple 200 groups of 70
7. 6.27 x 100
8. The sum of ten squared and five squared
9. 715 ? 5
10. 8 groups of 102

59
Mental Math 29

1. Double 2000 added to 342 4342
2. 780 000 in scientific notation 7.8 x 105
3. 100.3 x 2 200.6
4. You spend 50.90 You have 100.00. What is your
   change? 49.10
5. Half of 612 306
6. Multiple 200 groups of 70 14 000
7. 6.27 x 100 627
8. The sum of ten squared and five squared 125
9. 715 ? 5 143
10. 8 groups of 102 800

60
Mental Math 30

1. The difference between three groups of five
   hundred and two hundred
2. 4555.5 in scientific notation
3. 200.2 x 3
4. You spend 65.00 You have four 20.00 bills. What
   is your change?
5. Half of 866
6. Multiple 20 groups of 150
7. 6.27 x 100
8. The sum of two squared and three squared
9. 655 ? 5
10. 8.1 x 102

61
Mental Math 30

1. The difference between three groups of five
   hundred and two hundred 1300
2. 4555.5 in scientific notation 4.5555 x 103
3. 200.2 x 3 600.6
4. You spend 65.00 You have four 20.00 bills. What
   is your change? 15.00
5. Half of 866 433
6. Multiple 20 groups of 150 3000
7. 6.27 x 100 627
8. Sum of two squared and three squared 13
9. 655 ? 5 131
10. 8.1 x 102 810

62
Mental Math 31

1. The difference between five groups of one hundred
   and fifty
2. 735 000 in scientific notation
3. 400.5 x 2
4. You spend 71.00 You have two 50 bills. What is
   your change?
5. Half of 1040
6. Multiple 30 groups of 70
7. 97 x 1000
8. Sum of ten cubed and five squared
9. 723 ? 3
10. 52 x 103

63
Mental Math 31

1. The difference between five groups of one hundred
   and fifty 450
2. 735 000 in scientific notation 7.35 x 105
3. 400.5 x 2 801
4. You spend 71.00 You have two 50 bills. What is
   your change? 29.00
5. Half of 1040 520
6. Multiple 30 groups of 70 2100
7. 97 x 1000 97 000
8. Sum of ten cubed and five squared 1025
9. 723 ? 3 241
10. 52 x 103 52 000

64
Mental Math 32

1. Four groups of fifty decreased by one group of
   twenty
2. 94 000 in scientific notation
3. 5.4 2.9 5.6
4. You spend 69.00 You have four 20 bills. What is
   your change?
5. Half of 524
6. 5 groups of 500
7. 3 x 1000 7 x 100 5 x 1
8. Sum of five squared and ten squared
9. 590 ? 1000
10. 6 x 103

65
Mental Math 32

1. Four groups of fifty decreased by one group of
   twenty 180
2. 94 000 in scientific notation 9.4 x 104
3. 5.4 2.9 5.6 13.9
4. You spend 69.00 You have four 20 bills. What is
   your change? 11.00
5. Half of 524 262
6. 5 groups of 500 2500
7. 3 x 1000 7 x 100 5 x 1 3705
8. Sum of five squared and ten squared 125
9. 590 410 1000
10. 6 x 103 6000

66
Mental Math 33

1. Eight groups of one hundred decreased by three
   hundred fifty
2. 89 100 000 in scientific notation
3. 8.3 2.7 5.5
4. You spend 57.35 You have six 10 bills. What is
   your change?
5. Half of 966
6. 40 groups of 50
7. 3 x 100 9 x 1000 5 x 10
8. Sum of two cubed and four squared
9. 270 ? 1000
10. 4 x 101

67
Mental Math 33

1. Eight groups of one hundred decreased by three
   hundred fifty 450
2. 89 100 000 in scientific notation 8.91 x 107
3. 8.3 2.7 5.5 16.5
4. You spend 57.35 You have six 10 bills. What is
   your change? 2.65
5. Half of 966 483
6. 40 groups of 50 2000
7. 3 x 100 9 x 1000 5 x 10 9350
8. Sum of two cubed and four squared 24
9. 270 730 1000
10. 4 x 101 40

68
Mental Math 34

1. Three groups of two hundred increased by three
   groups of fifty
2. 5 550 000 in scientific notation
3. 1.5 1.5 1.5 6.5
4. You spend 32.50 You have two 20 bills. What is
   your change?
5. 972 ? 3
6. 30 groups of 500
7. (3) (-5)
8. Sum of three cubed and ten squared
9. I owe seven dollars to my friend. I get my
   allowance of ten dollars. What is my net worth?
   
10. 78 x 100

69
Mental Math 34

1. Three groups of two hundred increased by three
   groups of fifty 750
2. 5 550 000 in scientific notation 5.55 x 106
3. 1.5 1.5 1.5 6.5 11
4. You spend 32.50 You have two 20 bills. What is
   your change? 7.50
5. 972 ? 3 324
6. 30 groups of 500 15 000
7. (3) (-5) -2
8. Sum of three cubed and ten squared 127
9. I owe seven dollars to my friend. I get my
   allowance of ten dollars. What is my net worth?
   3
10. 78 x 100 78

70
Mental Math 35

1. Double 150 added to 198
2. 341.5 in scientific notation
3. 123 x 3
4. You spend 40.20 You have five 10.00. What is
   your change?
5. Half of 276
6. Multiple 90 groups of 90
7. (-5) - (-8)
8. Two to the exponent four
9. 6/30 in lowest terms is
10. 7 groups of 100

71
Mental Math 35

1. Double 150 added to 198 498
2. 341.5 in scientific notation 3.415 x 102
3. 123 x 3 369
4. You spend 40.20 You have five 10.00. What is
   your change? 9.80
5. Half of 276 138
6. Multiple 90 groups of 90 8100
7. (-5) - (-8) 3
8. Two to the exponent four 16
9. 6/30 in lowest terms is 1/5
10. 7 groups of 100 7

72
Mental Math 36

1. Double 551
2. 40 500 in scientific notation
3. 312 x 3
4. You spend 73.90 You have four 20.00. What is
   your change?
5. Half of 724
6. Multiple 40 groups of 600
7. (5) - (-4)
8. Two to the exponent five plus five
9. 4/12 in lowest terms is
10. 12/5 as a mixed number

73
Mental Math 36

1. Double 551 1102
2. 40 500 in scientific notation 4.05 x 104
3. 312 x 3 936
4. You spend 73.90 You have four 20.00. What is
   your change? 6.10
5. Half of 724 362
6. Multiple 40 groups of 600 24 000
7. (5) - (-4) 9
8. Two to the exponent five plus five 37
9. 4/12 in lowest terms is 1/3
10. 12/5 as a mixed number 2 2/5

74
Mental Math 37

1. Double 623
2. 800 000 in scientific notation
3. 211 x 5
4. You spend 53.50 You have three 20.00. What is
   your change?
5. Half of 872
6. Multiple 60 groups of 600
7. (1) (-4)
8. Five to the exponent two plus ten
9. 3/15 in lowest terms is
10. 14/3 as a mixed number

75
Mental Math 37

1. Double 623 1246
2. 800 000 in scientific notation 8 x 105
3. 211 x 5 1055
4. You spend 53.50 You have three 20.00. What is
   your change? 6.50
5. Half of 872 436
6. Multiple 60 groups of 600 36 000
7. (1) (-4) -3
8. Five to the exponent two plus ten 35
9. 3/15 in lowest terms is 1/5
10. 14/3 as a mixed number 4 2/3

76
Mental Math 38

1. Which is larger 2/11 or 2/9
2. Which is larger 5/11 or 4/7
3. Which is larger 0.8 or 0.553
4. 12/18 in lowest terms
5. 18/4 as a mixed number
6. 3/10 as a percent
7. 2/25 as a percent
8. 0.05 as a percent
9. 131/100 as a decimal
10. 9/10 of a bars added to 5/8 of a bar is closer
    to 1, 1 1/2 or 2 whole bars

77
Mental Math 38

1. Which is larger 2/11 or 2/9 2/9
2. Which is larger 5/11 or 4/7 4/7
3. Which is larger 0.8 or 0.553 0.8
4. 12/18 in lowest terms 2/3
5. 18/4 as a mixed number 4 1/2
6. 3/10 as a percent 30
7. 2/25 as a percent 8
8. 0.05 as a percent 5
9. 131/100 as a decimal 1.31
10. 9/10 of a bars added to 5/8 of a bar is closer
    to 1, 1 1/2 or 2 whole bars 1 1/2

78
Mental Math 39

1. Which is larger 5/9 or 3/8
2. Which is larger 6/10 or 11/20
3. Which is larger 0.2 or 0.199
4. 6/15 in lowest terms
5. 15/3 as a mixed number
6. 9/10 as a percent
7. 11/20 as a percent
8. 0.18 as a percent
9. 235/100 as a decimal
10. 5/12 of a bars added to 11/20 of a bar is closer
    to 1, 1 1/2 or 2 whole bars

79
Mental Math 39

1. Which is larger 5/9 or 3/8 5/9
2. Which is larger 6/10 or 11/20 6/10
3. Which is larger 0.2 or 0.199 0.2
4. 6/15 in lowest terms 2/5
5. 15/3 as a mixed number 5
6. 9/10 as a percent 90
7. 11/20 as a percent 55
8. 0.18 as a percent 18
9. 235/100 as a decimal 2.35
10. 5/12 of a bars added to 11/20 of a bar is closer
    to 1, 1 1/2 or 2 whole bars 1

80
Mental Math 40

• Which is larger 11/20 or 7/18
• Which is larger 20/40 or 5/8
• Which is larger 0.321 or 0.319
• 16/20 in lowest terms
• 7/2 as a mixed number
• 1/5 of 20
• 5/25 as a percent
• 0.07 as a percent
• 34/100 as a decimal
• 11/12 11/20 of a bar is closer to 1,
• 1 1/2 or 2 whole bars

81
Mental Math 40

• Which is larger 11/20 or 7/18 11/20
• Which is larger 20/40 or 5/8 5/8
• Which is larger 0.321 or 0.319 0.321
• 16/20 in lowest terms 4/5
• 7/2 as a mixed number 3 1/2
• 1/5 of 20 4
• 5/25 as a percent 20
• 0.07 as a percent 7
• 34/100 as a decimal 0.34
• 11/12 11/20 of a bar is closer to 1,
• 1 1/2 or 2 whole bars 1 1/2