Year 1 maths · A.3 · Addition and Subtraction to 20
Find the missing number to 20
See worked examples
□ + 11 = 17 What number goes in the box?
Answer: 6
□ − 9 = 10 What number goes in the box?
Answer: 19
□ + 8 = 20 What number goes in the box?
Answer: 12
Practise without limits
Members practise as much as they like, every day, and get the printable packs and lessons too.