Week 5TuesdaySubtracting 11-20
1Review: Subtract from 10

Quick review: subtract from 10.

10 − 4 =

10 − 7 =

10 − 2 =

10 − 5 =

10 − 8 =

10 − 3 =

2Strategy: Make 10 First

Subtracting from Numbers 11-20

Strategy: Make 10 first!

13 − 5: Think "13 − 3 = 10, then 10 − 2 = 8"

3Practice Problems

Use any strategy you like.

13 − 5 =

14 − 6 =

12 − 4 =

15 − 7 =

11 − 3 =

16 − 8 =

4Show Two Different Ways

Show Two Different Ways

15 − 7

Way 1 (make 10): 15 − = 10, 10 − =

Way 2 (addition): 7 + = 15, so 15 − 7 =

17 − 9

Way 1 (make 10): 17 − = 10, 10 − =

Way 2 (addition): 9 + = 17, so 17 − 9 =

5Challenge: Explain Your Thinking

Explain Your Thinking

How would you solve 16 − 8? Write or draw your strategy.