Math Puzzles 9 [With Answers]

Puzzle 1: What number replaces the question mark?

1 + 1 = 8

2 + 2 = 32

3 + 3 = 72

4 + 4 = ?

Answer: 128

4 (1 + 1) = 8

8 (2 + 2) = 32

12 (3 + 3) =72

16 (4 + 4) = 128

Puzzle 2: What comes next in the sequence?

1 + 5 = 18

2 + 10 = 36

3 + 15 = 54

4 + 20 =?

Answer: 72

The logic applied here is 3 (a + b)

3 (1 + 5) = 18

3(2 + 10) = 36

3(3 + 15) = 54

3(4 + 20) =72

Puzzle 3: What number replaces the question mark?

If 1 x 1 = 2

2 x 2 = 4

3 x 3 =6

4 x 4 = 8

Then 4 x 1 =?

Answer: 5

The logic applied here is (a + b)

So, 4 + 1 = 5

Puzzle 4: What number replaces the question mark?

Answer: Sum of numbers on each line is 15.

6 + 5 + 4 = 15

3 + 5 + 7 = 15

9 + 5 + 1 = 15

8 + 5 + 2 = 15

So, answer is 2.

Puzzle 5: What number replaces the question mark?

If 1 - 1 = 0

2 - 1 = 3

3 - 1 = 8

Then 5 - 1 =?

Answer: 24

1 x 1 - 1 = 0

2 x 2 - 1 = 3

3 x 3 - 1 = 8

5 x 5 - 1 = 24