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Daily 30 Seconds 


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Can you solve the mathematical questions in 30 seconds?

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Easy – Sep 18

−1
SQUARE
+1
÷2
−13
×7
+2
HALVE
+11
?
 

Puzzle Copyright © Kevin Stone


Medium – Sep 18

DOUBLE
−16
HALVE
−18
×5
+1
×7/9
−3
×2
?
 

Puzzle Copyright © Kevin Stone


Hard – Sep 18

×25%
HALVE
SQUARE
+1
×31/2
−1
×11/3
+4
÷11
?
 

Puzzle Copyright © Kevin Stone


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Notes 


Click 'start' to see the starting number, and then follow the instructions, one at a time, until you reach the end. Not everyone can solve every 30 Seconds puzzle within 30 seconds.

I have deliberately chosen not include the answers – you can use a calculator to see the value at each stage of the calculation.

Note: take a look at the information about the difficulty levels.

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