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You can't use a calculator. Test your mental math with our questions. Improve you mental math.

1

3600

You multiply 6 by 6 which is 36. Include two 0's from 6's which is 3600.

2

0 —

2

— 10

Write 81 as 9^2. Remove the nines. Include powers. x=2. Sub-topic of indices and surds and standard form.

3

4

27

3^(2) x 3. 9x3 = 27.

5

6400

40x10x16
400x16
800x8
6400

6

1159 —

3200

— 10000

60x40
6x4=32
32 include 2 0s from 6 and 4. = 3200

7

1

Identity sin^(2)d+cos^(2)d=1