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REGROUPING (BORROWING)

Borrow from the next place value when the top digit is smaller.

L3L4

CS.N.2.3·Performing addition and subtraction 0–1000(II)CS.N.3.2·Using calculation techniques with numbers 0–10000(III)

Section 1 / 3

WHEN YOU CAN'T SUBTRACT THE ONES

In column subtraction, sometimes the top digit is smaller than the bottom digit. When this happens, you need to regroup (borrow): take 1 ten from the tens column and add 10 ones to the ones column.

42 - 17

12 < 7, need to regroup

2Borrow from tens: 3 tens + 12 ones

312 - 7 = 5

43 - 1 = 2

5Answer: 25

= 25

LEADER TIP

Use place-value mats with actual base-ten blocks. Students must physically exchange 1 ten for 10 ones.

BEFORE THIS LESSON, TRY

📏Number Line Jumps

PRACTICE WITH THESE GAMES

🎯Subtraction Quiz 🏃Fast Subtraction �Calc Cascade

Want more practice? Generate printable worksheets with similar problems.

Go to Worksheets

CONTINUE WITH:

📝Subtraction Word Problems 🎯Subtraction Estimation

REGROUPING (BORROWING)

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