6.

Number Puzzles Questions and Answers

A. 9
B. 4
C. 5
D. 6
Answer: : 6

Explanation: :

Looking at the diagram in rows, the central circle equals half the sum of the numbers in the other circles to the left and right of the centre.





7.

Number Puzzles Questions and Answers

A. 9
B. 8
C. 4
D. 1
Answer: : 9

Explanation: :

The number at the centre of each triangle equals the sum of the lower two numbers minus the top number.





8.

Number Puzzles Questions and Answers

A. 23
B. 9
C. 19
D. 31
Answer: : 19

Explanation: :

As you move diagonally down, numbers follow the sequence of Prime Numbers.





9.

Number Puzzles Questions and Answers

A. 16
B. 37
C. 55
D. 2
Answer: : 16

Explanation: :

Starting bottom left and moving clockwise around the triangle, numbers follow the sequence of Square Numbers.





10.

Number Puzzles Questions and Answers

A. 33
B. 37
C. 39
D. 46
Answer: : 39

Explanation: :

Working from top to bottom, double each number and subtract 1, then 2, then 3 etc.