Mental arithmetic
What is 2 + 2?
4
What is 7 - 3?
4
What is 12 x 5?
60
What is 20 ÷ 4?
7
What is the square root of 49?
7
What is 18 + 7?
25
What is 15 - 9?
6
What is 24 ÷ 3?
6
What is 10 x 8?
80
What is 36 - 15?
21
What is the cube root of 3
27
Multiply 26 by 20
520