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 21 /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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