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Subtracting 3 Digit Numbers

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Joyce Takagi
Joyce Takagi

2nd Grade Model for how to subtract 2 and 3 digit numbers. Educational Reproduction or Modification allowed. Not for commercial use.

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WHY DO I REGROUP AND HOW DO I DO IT?Lets find out!
WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH ONES TO SUBTRACT FROM? Lets make a model! Now, lets trade a ten! Why did we need to regroup? 2 2 7-
WHY DO WE NEED TO REGROUP? 2 2 7- We need to regroup because we dont have enough ones to take away 7. There are more ones on the floor.
HOW DO WE REGROUP? 2 2 7- We need to regroup by borrowing a ten. Go next door and get 10 more. 1
HOW DO WE REGROUP? 2 2 7- We need to regroup by borrowing a ten. Go next door and get 10 more. 1 12
NOW WE CAN SOLVE THE PROBLEM 2 2 7- We need to subtract the ones first. 12-7 is 5 (11, 10, 9, 8, 7) 1 12 5
NOW WE CAN SOLVE THE PROBLEM 2 2 7- Now, we subtract the tens. 1-0 is 1 1 12 5
WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH TENS TO SUBTRACT FROM? Lets make a model! Now, lets trade a hundred! 2 5 5- 8 9 0
WHY DO WE NEED TO REGROUP? 8 5 5- We need to regroup because we dont have enough tens to take away 9 tens. There are more tens on the floor. 2 9 0
HOW DO WE REGROUP? 8 5 5- We need to regroup by taking 1 hundred and give it to the tens. Go next door and get ten more. 2 9 0 1
HOW DO WE REGROUP? 8 5 5- We need to regroup by taking 1 hundred and give it to the tens. Go next door and get ten more. 2 9 0 1 18
NOW WE CAN FINISH SOLVING 8 5 5- We already subtracted the ones, so now we subtract the tens. 18-9= 9 because I know 9+9=18. 2 9 0 1 18 9
NOW WE CAN FINISH SOLVING 8 5 5- We already subtracted the tens, so now we subtract the hundreds. 1-0=1, so the answer is 190 2 9 0 1 18 9 0 1

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Subtracting 3 Digit Numbers

  • 1. WHY DO I REGROUP AND HOW DO I DO IT?Lets find out!
  • 2. WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH ONES TO SUBTRACT FROM? Lets make a model! Now, lets trade a ten! Why did we need to regroup? 2 2 7-
  • 3. WHY DO WE NEED TO REGROUP? 2 2 7- We need to regroup because we dont have enough ones to take away 7. There are more ones on the floor.
  • 4. HOW DO WE REGROUP? 2 2 7- We need to regroup by borrowing a ten. Go next door and get 10 more. 1
  • 5. HOW DO WE REGROUP? 2 2 7- We need to regroup by borrowing a ten. Go next door and get 10 more. 1 12
  • 6. NOW WE CAN SOLVE THE PROBLEM 2 2 7- We need to subtract the ones first. 12-7 is 5 (11, 10, 9, 8, 7) 1 12 5
  • 7. NOW WE CAN SOLVE THE PROBLEM 2 2 7- Now, we subtract the tens. 1-0 is 1 1 12 5
  • 8. WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH TENS TO SUBTRACT FROM? Lets make a model! Now, lets trade a hundred! 2 5 5- 8 9 0
  • 9. WHY DO WE NEED TO REGROUP? 8 5 5- We need to regroup because we dont have enough tens to take away 9 tens. There are more tens on the floor. 2 9 0
  • 10. HOW DO WE REGROUP? 8 5 5- We need to regroup by taking 1 hundred and give it to the tens. Go next door and get ten more. 2 9 0 1
  • 11. HOW DO WE REGROUP? 8 5 5- We need to regroup by taking 1 hundred and give it to the tens. Go next door and get ten more. 2 9 0 1 18
  • 12. NOW WE CAN FINISH SOLVING 8 5 5- We already subtracted the ones, so now we subtract the tens. 18-9= 9 because I know 9+9=18. 2 9 0 1 18 9
  • 13. NOW WE CAN FINISH SOLVING 8 5 5- We already subtracted the tens, so now we subtract the hundreds. 1-0=1, so the answer is 190 2 9 0 1 18 9 0 1