Quick review: subtract from 10.
10 − 4 =
10 − 7 =
10 − 2 =
10 − 5 =
10 − 8 =
10 − 3 =
Subtracting from Numbers 11-20
Strategy: Make 10 first!
13 − 5: Think "13 − 3 = 10, then 10 − 2 = 8"
Use any strategy you like.
13 − 5 =
14 − 6 =
12 − 4 =
15 − 7 =
11 − 3 =
16 − 8 =
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 =
Explain Your Thinking
How would you solve 16 − 8? Write or draw your strategy.