30 Seconds 30 Seconds


30 Seconds

Would you like to use 30 Seconds puzzles in your publication?

I can provide 30 Seconds puzzles in the difficulties listed below, in any print size, and at any resolution, and in most print formats (including TIFF, PNG, JPG, PDF, etc). Please feel free to contact me to discuss your requirements for 30 Seconds puzzles, and if required I'll send you some printable samples.

Level 1 - Level 2 - Level 3


30 Seconds Help Section

Can you solve 3 mathematical questions in 30 seconds?

The objective for the 30 seconds puzzle is for you to solve all calculations within 30 seconds. Click or move your mouse over a puzzle to see its answer.

You can play the 30 Seconds puzzle (or any of the other BrainBashers puzzles), so you can understand more about the 30 Seconds Puzzle. I have explained the difficulty levels in more detail, to give you a better understanding of what I mean by Level 1, Level 2 and Level 3, and how that corresponds to BrainBashers easy, medium, and hard.

30 Seconds: Level 1 (Easy)

9
−3
×4
+12
HALVE
−8
÷2
+8
×3
+16
? 55
9
−3
=6
×4
=24
+12
=36
HALVE
=18
−8
=10
÷2
=5
+8
=13
×3
=39
+16
55

How To Solve 30 Seconds Level 1 - Starting from the first number, which is 9, always working from left to right:
    9 - 3 = 6
    6 x 4 = 24
  24 + 12 = 36
36 halved = 18
   18 - 8 = 10
   10 / 2 = 5
    5 + 8 = 13
   13 x 3 = 39
  39 + 16 = 55


30 Seconds: Level 2 (Medium)

22
−8
HALVE
SQUARE
−2
DOUBLE
−17
×2
+8
×4/9
? 72
22
−8
=14
HALVE
=7
SQUARE
=49
−2
=47
DOUBLE
=94
−17
=77
×2
=154
+8
=162
×4/9
72

How To Solve 30 Seconds Level 2 - Starting from the first number, which in this case is 22, always working from left to right:
     22 - 8 = 14
  14 halved = 7
  7 squared = 49
     49 - 2 = 47
 47 doubled = 94
    94 - 17 = 77
     77 x 2 = 154
    154 + 8 = 162
(162/9) x 4 = 72


30 Seconds: Level 3 (Hard)

87
+4
×7/13
CUBE
+2
×13/5
HALVE
×25%
×2
? 138
87
+4
=91
×7/13
=49

=7
CUBE
=343
+2
=345
×13/5
=552
HALVE
=276
×25%
=69
×2
138

How To Solve 30 Seconds Level 3 - Starting from the first number, which in this case is 87, always working from left to right:
             87 + 4 = 91
        (91/13) x 7 = 49
               49 √ = 7
            7 cubed = 343
            343 + 2 = 345
(345x1)+((345/5)x3) = 552
         552 halved = 276
          276 x 25% = 69
             69 x 2 = 138

The following may be useful: HALVE divide by 2. DOUBLE multiply by 2. SQUARE times by itself. CUBE times by itself twice.

x 3/5 find three fifths. x 2 1/3 find two and a third. x 10% find 10%. √ find the square root.

You can use a calculator to see the value at each stage of the calculation, but please remember to only do one calculation at a time. For example, 9 - 3 = 6, then 6 x 4 = 24, rather than 9 - 3 x 4, which would equal -3 on a calculator.