Subtraction Across Zeroes

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# Subtraction Across Zeroes - PowerPoint PPT Presentation

39. 13. 19. 10. 403 - 25. 200 - 99. Subtraction Across Zeroes. By Jamie Unverzagt. Hundreds Tens Ones. Let’s model 102 minus 38 . Begin by showing 102. 102. - 38. Hundreds Tens Ones. If you have 2 ones , can you take away 8 ones ?. 10 2.

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Presentation Transcript

39

13

19

10

403 - 25

200

- 99

### Subtraction Across Zeroes

By Jamie Unverzagt

Hundreds Tens Ones

Let’s model 102 minus 38. Begin by showing 102.

102

- 38

Hundreds Tens Ones

If you have 2 ones, can you take away8 ones?

102

- 38

Hundreds Tens Ones

How can you get more ones? There are no tens to trade!

102

- 38

Hundreds Tens Ones

How many tens are in ahundred?

102

- 38

Hundreds Tens Ones

Good thinking!

102

1 Hundred is the same as 10 tens!

- 38

Hundreds Tens Ones

102

Now can you get more ones?

- 38

Hundreds Tens Ones

9

12

102

How many tens and ones now?

- 38

Hundreds Tens Ones

9

12

What’s the next step?

102

- 38

How many ones are left?

4

Hundreds Tens Ones

9

12

What’s the next step?

102

- 38

How many tens are left?

6

4

Hundreds Tens Ones

Let’s model 203 minus 57. Begin by showing 203.

203

- 57

Hundreds Tens Ones

If you have 3 ones, can you take7 onesaway?

203

- 57

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

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

Hundreds Tens Ones

19 tens

19

That’s 19 tens left

203

which is the same as 1 hundred and 9 tens.

- 57

Hundreds Tens Ones

19

13

How many ones do you have now?

203

- 57

Hundreds Tens Ones

19

13

What is 13 ones minus 7 ones?

203

- 57

6

Hundreds Tens Ones

19

13

Finish subtracting.

203

You’ve Got It!

- 57

1

4

6

39

10

400

- 9

3

9

1

49

12

502

### Subtract Across Zeroes

- 14

4

8

8

5

10

Don’t regroup if you don’t have to!

608

Slow Down!

- 234

3

7

4

69

12

702

- 213

4

8

9