Can you solve the mathematical questions in 30 seconds?

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## Easy – Apr 17

Puzzle Copyright © Kevin Stone

## Medium – Apr 17

Puzzle Copyright © Kevin Stone

## Hard – Apr 17

Puzzle Copyright © Kevin Stone

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## Notes

Click 'start' to see the starting number, and then follow the instructions until you get to the end. Not everyone can solve every 30 Seconds puzzle within 30 seconds.

- HALVE divide by 2 (e.g. 10 ÷ 2 = 5)
- DOUBLE multiply by 2 (e.g. 10 x 2 = 20)
- SQUARE times by itself (e.g. 10 x 10 = 100)
- CUBE times by itself twice (e.g. 10 x 10 x 10 = 1,000)
- ×
^{3}/_{5}find three fifths (e.g.^{1}/_{5}of 15 = 3, so^{3}/_{5}= 9) - ×2
^{1}/_{3}find two and a third (e.g. 2^{1}/_{3}of 15 = 2 x 15 + 5 = 35) - ×10% find 10% (e.g. 10% of 80 = 8)
- √ find the square root (e.g. the square root of 100 is 10)

I have deliberately chosen not include the answers – you can use a calculator to see the value at each stage of the calculation.

**Note:** take a look at the information about the difficulty levels.

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