1.  


4
5
6
7


Answer

 Option

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.

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2.  


9
12
6
8


Answer

 Option

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

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3.  


17
19
21
23


Answer

 Option

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

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4.  


12
16
20
24


Answer

 Option

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

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5.  


37
38
39
40


Answer

 Option

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

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