Numbers 11 to 20: tens and ones
Answers are for parents and teachers.
1
Write the numbers 11 to 20, then backwards from 20 to 11.
11, 12, …, 20 · 20, 19, …, 11
2
Write as tens plus ones: 12, 15, 18, 20
10 + 2, 10 + 5, 10 + 8, 10 + 10
3
Work out: 8 + 3, 7 + 5, 9 + 5, 6 + 6
11, 12, 14, 12
4
Work out: 12 − 2, 14 − 4, 13 − 10, 11 − 1
10, 10, 3, 10
5
Problem: An orchard has 10 apple trees and 3 pear trees. How many trees in all?
13