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.
Explanation: The number at the centre of each triangle equals the sum of the lower two numbers minus the top number.
Explanation: As you move diagonally down, numbers follow the sequence of Prime Numbers.
Explanation: Starting bottom left and moving clockwise around the triangle, numbers follow the sequence of Square Numbers.
Working from top to bottom, double each number and subtract 1, then 2, then 3 etc.
Explanation: Working in columns, the sum of the numbers in each column is always 14.
Answer: 6
Explanation: The numbers in each row and column add up to 15.
Explanation: Moving from left to right, numbers increase by 2,3,4 and 5.
Explanation: In each square of the diagram, the sum of the numbers is always 22.
Answer: 16
Explanation: Moving clockwise, around alternate segments in the chain, one sequence decreases by 1, 2, 3 and 4 each time, while the other increases by 2, 3, 4 and 5.
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