Daily 30 Seconds  Feb 28
Can you solve 3 mathematical questions in 30 seconds? Click 'Start' to see the number you're starting with, and then follow the instructions until you get to the end.
Easy
Puzzle Copyright © Kevin Stone
Medium
Puzzle Copyright © Kevin Stone
Hard
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.
