THINK ADDITION

Use the inverse relationship: turn subtraction into a missing addend problem.

L2L3

CS.N.1.5·Performing subtraction with numbers 0–100(I)CS.N.2.4·Relationship between addition and subtraction(II)

Section 1 / 3

TURN SUBTRACTION INTO ADDITION

Instead of subtracting, ask: what do I add to the smaller number to reach the bigger one? For 13-5, think: 5 + ? = 13. If you know your addition facts, subtraction becomes much easier!

13 - 5 = ?

1Think: 5 + ? = 13

25 + 8 = 13

3So 13 - 5 = 8

= 8

LEADER TIP

Fact families help students see the connection. Write all four facts together: 5+7=12, 7+5=12, 12-5=7, 12-7=5.

BEFORE THIS LESSON, TRY

Counting Back

PRACTICE WITH THESE GAMES

Fast Subtraction

Missing Number

Subtraction Memory

Want more practice? Generate printable worksheets with similar problems.

Go to Worksheets

CONTINUE WITH:

Addition Word Problems

Subtraction Compensation

THINK ADDITION

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THINK ADDITION