Can you solve the mathematical questions in 30 seconds? 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.
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Dec 04 - Easy
Puzzle Copyright © Kevin Stone
Dec 04 - Medium
Puzzle Copyright © Kevin Stone
Dec 04 - Hard
Puzzle Copyright © Kevin Stone
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Notes
Note: take a look at the information about the difficulty levels.
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- 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)
- ×21/3 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 - but you could use a calculator to see the value at each stage of the calculation.
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