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.
Sep 25 - Easy
Puzzle Copyright © Kevin Stone
Sep 25 - Medium
Puzzle Copyright © Kevin Stone
Sep 25 - Hard
Puzzle Copyright © Kevin Stone
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Notes
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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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