Add
14+7
What is 21
14-7
What is 7
19+5
What is 24
43+10
What is 53
43-10
What is 33
78-10
What is 68
54+20
What is 74
54-20
What is 34
64+7
What is 71
75+35
What is 110
75-35
What is 40
75-11
What is 64
64+47
What is 111
64-47
What is 17
10+10-9
What is 11