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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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subtraction across zeroes

39

13

19

10

403 - 25

200

- 99

Subtraction Across Zeroes

By Jamie Unverzagt

slide2

Hundreds Tens Ones

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

102

- 38

slide3

Hundreds Tens Ones

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

102

- 38

slide4

Hundreds Tens Ones

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

102

- 38

slide5

Hundreds Tens Ones

How many tens are in ahundred?

102

- 38

slide6

Hundreds Tens Ones

Good thinking!

102

1 Hundred is the same as 10 tens!

- 38

slide7

Hundreds Tens Ones

102

Now can you get more ones?

- 38

slide8

Hundreds Tens Ones

9

12

102

How many tens and ones now?

- 38

slide9

Hundreds Tens Ones

9

12

What’s the next step?

102

- 38

How many ones are left?

4

slide10

Hundreds Tens Ones

9

12

What’s the next step?

102

- 38

How many tens are left?

6

4

slide11

Hundreds Tens Ones

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

203

- 57

slide12

Hundreds Tens Ones

If you have 3 ones, can you take7 onesaway?

203

- 57

slide13

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

slide14

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

slide15

Hundreds Tens Ones

19 tens

19

That’s 19 tens left

203

which is the same as 1 hundred and 9 tens.

- 57

slide16

Hundreds Tens Ones

19

13

How many ones do you have now?

203

- 57

slide17

Hundreds Tens Ones

19

13

What is 13 ones minus 7 ones?

203

- 57

6

slide18

Hundreds Tens Ones

19

13

Finish subtracting.

203

You’ve Got It!

- 57

1

4

6

subtract across zeroes2

5

10

Don’t regroup if you don’t have to!

608

Subtract Across Zeroes

Slow Down!

- 234

3

7

4

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