What is 11 + 10?
21
What is 11 - 10?
1
What is 7 + 5?
12
What is 4 + 6?
10
What is 15 - 5?
10
What is 10 + 8?
18
What is 10 - 3?
7
What is 9 - 4?
5
What is 20 - 6?
14