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Subtraction Across Zeroes

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Presentation on theme: "Subtraction Across Zeroes"— Presentation transcript:

1 Subtraction Across Zeroes
39 13 19 10 200 Subtraction Across Zeroes By Jamie Unverzagt

2 - 38 102 Let’s model 102 minus 38. Begin by showing 102.
Hundreds Tens Ones Let’s model 102 minus 38. Begin by showing 102. 102

3 - 38 102 If you have 2 ones, can you take away 8 ones?
Hundreds Tens Ones If you have 2 ones, can you take away 8 ones? 102

4 - 38 102 How can you get more ones? There are no tens to trade!
Hundreds Tens Ones How can you get more ones? There are no tens to trade! 102

5 Hundreds Tens Ones How many tens are in a hundred? 102

6 Good thinking! - 38 102 1 Hundred is the same as 10 tens!
Hundreds Tens Ones Good thinking! 102 1 Hundred is the same as 10 tens!

7 Hundreds Tens Ones 102 Now can you get more ones?

8 Hundreds Tens Ones 9 12 102 How many tens and ones now?

9 - 38 4 102 What’s the next step? 9 12 How many ones are left?
Hundreds Tens Ones 9 12 What’s the next step? 102 How many ones are left? 4

10 - 38 6 4 102 What’s the next step? 9 12 How many tens are left?
Hundreds Tens Ones 9 12 What’s the next step? 102 How many tens are left? 6 4

11 - 57 203 Let’s model 203 minus 57. Begin by showing 203.
Hundreds Tens Ones Let’s model 203 minus 57. Begin by showing 203. 203

12 - 57 203 If you have 3 ones, can you take 7 ones away?
Hundreds Tens Ones If you have 3 ones, can you take 7 ones away? 203

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

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

15 Hundreds Tens Ones 19 tens 19 That’s 19 tens left 203 which is the same as 1 hundred and 9 tens.

16 Hundreds Tens Ones 19 13 How many ones do you have now? 203

17 Hundreds Tens Ones 19 13 What is 13 ones minus 7 ones? 203 6

18 You’ve Got It! - 57 203 1 4 6 19 13 Finish subtracting.
Hundreds Tens Ones 19 13 Finish subtracting. 203 You’ve Got It! 1 4 6

19 Subtract Across Zeroes
39 10 400 - 9 3 9 1

20 Subtract Across Zeroes
49 12 502 - 14 4 8 8

21 Subtract Across Zeroes
5 10 Don’t regroup if you don’t have to! 608 Slow Down! - 234 3 7 4

22 Subtract Across Zeroes
69 12 702 - 213 4 8 9

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