Daily 30 Seconds - May 29

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Can you solve 3 mathematical questions in 30 seconds? You might need a pencil and some paper! Click 'Start' to see the number you're starting with, and then follow the instructions until you get to the end.

Easy

Starting Number = 3

Puzzle Copyright © Kevin Stone

Medium

Starting Number = 19

Puzzle Copyright © Kevin Stone

Hard

Starting Number = 61

Puzzle Copyright © Kevin Stone

Notes

All daily items change at midnight GMT.

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)
x ^{3} /_{5} find three fifths (e.g. ^{1} /_{5} of 15 = 3, so ^{3} /_{5} = 9)
x 2^{1} /_{3} find two and a third (e.g. 2 ^{1} /_{3} of 15 = 2 x 15 + 5 = 35)
x 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.

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