Subtraction Across Zeroes

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Presentation transcript:

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

- 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 - 38

- 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 - 38

- 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 - 38

Hundreds Tens Ones How many tens are in a hundred? 102 - 38

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! - 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

- 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 - 38 How many ones are left? 4

- 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 - 38 How many tens are left? 6 4

- 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 - 57

- 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 - 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

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! - 57 1 4 6

Subtract Across Zeroes 39 10 400 - 9 3 9 1

Subtract Across Zeroes 49 12 502 - 14 4 8 8

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

Subtract Across Zeroes 69 12 702 - 213 4 8 9