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)

What would you like to share?

REGROUPING (BORROWING)