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Daily 30 Seconds - Jan 23

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Click 'Start' to see the number you're starting with, and then follow the instructions until you get to the end.

Easy

+15

×4

−13

÷9

−1

 

HALVE

+4

×7

+1

?

Puzzle Copyright © Kevin Stone

Medium

DOUBLE

−6

×4

−3

2/5

 

HALVE

+3

1/2

×5

?

Puzzle Copyright © Kevin Stone

Hard

×2

−18

x 25%

CUBE

 

−8

2/9

−16

SQUARE

?

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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