Ways to subtract within 20
Answers are for parents and teachers.
1
Work out: 18 − 5, 16 − 3, 19 − 7, 14 − 4
13, 13, 12, 10
2
Subtract in parts: 12 − 4, 13 − 6, 15 − 8, 11 − 5
8, 7, 7, 6
3
Solve one sum in two ways: 14 − 9
14 − 4 − 5 = 5; (10 − 9) + 4 = 5
4
Problem: A class has 17 pencils. 9 are red and the rest blue. How many are blue?
8
5
Problem: Today is 5 December. The concert is on 18 December. How many days are left?
13