What you need to know
You need to:
add 2-digit numbers using the column method
add 3 one-digit numbers
use doubles facts and number facts to 20
use addition to solve missing number subtraction problems.
- Look for doubles, or pairs that add up to 10 or 20.
Number facts Doubles 0 + 10 = 10 0 + 20 = 20 11 + 9 = 20 0 + 0 = 0 1 + 9 = 10 1 + 19 = 20 12 + 8 = 20 1 + 1 = 2 2 + 8 = 10 2 + 18 = 20 13 + 7 = 20 2 + 2 = 4 3 + 7 = 10 3 + 17 = 20 14 + 6 = 20 3 + 3 = 6 4 + 6 = 10 4 + 16 = 20 15 + 5 = 20 4 + 4 = 8 5 + 5 = 10 5 + 15 = 20 16 + 4 = 20 5 + 5 = 10 6 + 4 = 10 6 + 14 = 20 17 + 3 = 20 6 + 6 = 12 7 + 3 = 10 7 + 13 = 20 18 + 2 = 20 7 + 7 = 14 8 + 2 = 10 8 + 12 = 20 19 + 1 = 20 8 + 8 = 16 9 + 1 = 10 9 + 11 = 20 20 + 0 = 20 9 + 9 = 18 10 + 0 = 10 10 + 10 = 20 10 + 10 = 20