Daily 30 Seconds - Sat - Easy

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

−9

HALVE

SQUARE

×5

+7

÷3

−4

÷5

+12

?

Copyright © Kevin Stone

Daily 30 Seconds - Sat - Medium

−19

×3

−4

x 1/5

DOUBLE

−2

x 2/3

−15

SQUARE

?

Copyright © Kevin Stone

Daily 30 Seconds - Sat - Hard

×2

−8

x 25%

−5

÷7

CUBE

−6

x 5/7

x 20%

?

Copyright © Kevin Stone

Notes

All daily items change at midnight GMT (it is roughly 1:19 AM GMT). Change.

• 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.