Math Teaching Tips 05

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Math Teaching Tips 05

• Victor Richardson
• Northwest Community College

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The Casio FX-260 Calculator

• Number Keys
• 4 Basic Arithmetic Keys , , ,
• Equal and Decimal Point
• Clear and All Clear Keys
• Change Sign Key
• Backspace Key
• Fraction Key
• Exponent Key
• Square and Square Root Key
• Parentheses Keys

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http//msvcc.blackboard.com
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An Alternative for Fraction Division
8
Traditional Method

• 2

2
5
10
1


3
3
1
3
5
Alternative
2
10

3
15
10
3
1
3

5
15
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Traditional Method
2
17
5
85
1
5


3
3
1
3
5
Alternative
2
85
17
5


3
15
85
3
3
1
3
1


5
15
5
10
Traditional Method
2
17
1
17
5
6


3
3
6
18
Alternative
2
17
5

3
3
17
18
6
18

1
3
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Converting Fractions to Decimals
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1
1

0.50 apiece
2
2 People
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1
1

0.50
2
2 People
14
1
1

0.25 apiece
4
4 People
15
1
1

0.25
4
4 People
16
2
2

0.40 apiece
5
5 People
17
2
2

0.40
5
5 People
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1
1

0.33? apiece
3
3 People
2
2

0.66? apiece
3
3 People
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1
1

0.33?
3
3 People
2
2

0.66?
3
3 People
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Comparing Fractions
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
Use a Common Denominator
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
1
8

3
24
3
9

8
24
1
12

2
24
1
6

4
24
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
1
8

3
24
9
3

8
24
1
12

2
24
1
6

4
24
24
Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
Use decimal equivalents
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
1

0.333
3
3

0.375
8
1

0.500
2
1

0.250
4
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
1

0.333
3
3

0.375
8
1

0.500
2
1

0.250
4
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Arrange the fractions ?, ?, ½, and ¼ in order
from least to greatest.
1

3
3

8
1

2
1

4
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Fraction Complements
fractions which combine to make one whole
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Fraction Complements

• A 20-ounce bottle contains 8 ounces of fluid.
  What fraction of the bottle is empty?
• 3/5
• 2/5
• 1/8
• 1/12
• 2/3

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To Get the Complement of a Fraction
2
_
2
5
5
5
_

3
3
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Help for

• Long Division

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2573 46

• First, make a times table for the divisor, 46.
• 1. 46
• 46
• 2. 92
• 46
• 3. 138
• 46
• 4. 184
• 46
• 5. 230
• 46
• 6. 276
• 46
• 7. 322
• 46
• 8. 368
• 46
• 9. 414

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2573 46

• Second, incrementally work the problem using the
  times table.
• 0 0 5
  55 r 43
• 46 ) 2 46 ) 25 46 ) 257 46 ) 2573
• 230 230
• 27 273
• 230
• 43

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Fun with

• Division

at www.allstarpuzzles.com/division
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Puzzle 88
Relax!
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Puzzle 88
S S S
E S E
D S D
S must be zero. (identity property of subtraction)
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Puzzle 88
I 0 0
I must be one.
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Puzzle 88
L 1 1
L must be 2.
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Puzzle 88
E 2 2
E must be 4.
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Puzzle 88
4 1 V
V must be 3.
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Puzzle 88
The likeliest letter here is R.
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Puzzle 88
2 5 A
A must be 7.
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Puzzle 88
7 1 B
B must be 6.
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Puzzle 88
0 2 N
N must be 8.
45
Puzzle 88
46
Puzzle 88
47

• www.aplusmath.com
• www.aaamath.com
• www.funbrain.com
• www.math.com
• www.mathgoodies.com
• www.teachrkids.com
• www.interactivestuff.com
• www.bbc.co.uk/skillswise
• www.gamequarium.com
• www.shodor.org
• www.lizardpoint.com
• www.scugog-net.com/room108

Internet websites for interactive math activities