Addition and Subtraction Facts Up to 20 - 1

Addition and Subtraction Facts Up to 20 - 1
Classroom Keystage 2-Maths - Calculations - Addition

[ To answer the questions please circle the correct answer or fill in the blank spaces ]

Addition and Subtraction Facts up to 20 - 1

Subtraction reverses addition sums (Subtraction is the inverse of addition) - look at this example:

18 + 1 = 19       19 - 1 = 18
Type in the correct answer to these addition sums.
0 + 19 = [__]           10 + 9 = [__]
1 + 18 = [__]           11 + 8 = [__]
2 + 17 = [__]           12 + 7 = [__]
3 + 16 = [__]           13 + 6 = [__]
4 + 15 = [__]           14 + 5 = [__]
5 + 14 = [__]           15 + 4 = [__]
6 + 13 = [__]           16 + 3 = [__]
7 + 12 = [__]           17 + 2 = [__]
8 + 11 = [__]           18 + 1 = [__]
9 + 10 = [__]           19 + 0 = [__]
What do you notice about the pattern of the answers? [, Answers go down by one, All answers are the same, Answers go up in one]