30 Seconds 3-In-A-Row


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. The 30 Seconds Puzzle is available in the following formats:
Level 1 - Level 2 - Level 3

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

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 minus 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

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

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
(345 x 1) + ((345 / 5) x 3) = 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.