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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

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