In this worksheet, you must know your adding number bonds up to 20.
And that means knowing them off by heart.
Example
4 + 8
Answer
12
Remember
4 + 8 is the same as 8 + 4.
10 + 6 = 16 and 10 + 7 = 17 and so on.
0 + 5 = 5 and 0 + 19 = 19 and so on.
7 + 7 is twice 7 so 7 + 7 = 14.