Subtraction Across Zeroes

1
Subtraction Across Zeroes
39
19
13
10
403 - 25
200 - 99

• By Jamie Unverzagt

2
Hundreds Tens Ones
Lets model 102 minus 38. Begin by showing 102.
102
- 38
3
Hundreds Tens Ones
If you have 2 ones, can you take away 8 ones?
102
- 38
4
Hundreds Tens Ones
How can you get more ones? There are no tens to
trade!
102
- 38
5
Hundreds Tens Ones
How many tens are in a hundred?
102
- 38
6
Hundreds Tens Ones
Good thinking!
102
1 Hundred is the same as 10 tens!
- 38
7
Hundreds Tens Ones
102
Now can you get more ones?
- 38
8
Hundreds Tens Ones
9
12
102
How many tens and ones now?
- 38
9
Hundreds Tens Ones
Whats the next step?
9
12
102
- 38
How many ones are left?
4
10
Hundreds Tens Ones
Whats the next step?
9
12
102
- 38
How many tens are left?
4
6
11
Hundreds Tens Ones
Lets model 203 minus 57. Begin by showing 203.
203
- 57
12
Hundreds Tens Ones
If you have 3 ones, can you take 7 ones away?
203
- 57
13
Hundreds Tens Ones
10 tens 10 tens 20 tens
If 10 tens are in one hundred, how many tens are
in two hundreds?
203
- 57
14
Hundreds Tens Ones
20 tens- 1 ten 19 tens
Can you trade one of the 20 tens for ones? How
many tens are left?
203
- 57
15
Hundreds Tens Ones
19 tens
Thats 19 tens left
19
203
which is the same as 1 hundred and 9 tens.
- 57
16
Hundreds Tens Ones
How many ones do you have now?
19
13
203
- 57
17
Hundreds Tens Ones
What is 13 ones minus 7 ones?
19
13
203
- 57
6
18
Hundreds Tens Ones
Finish subtracting.
19
13
203
Youve Got It!
- 57
6
4
1
19
Subtract Across Zeroes
39
10
400
- 9
1
9
3
20
Subtract Across Zeroes
49
12
502
- 14
8
8
4
21
Subtract Across Zeroes
5
10
Dont regroup if you dont have to!
608
Slow Down!
- 234
4
7
3
22
Subtract Across Zeroes
69
12
702
- 213
9
8
4