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View Answer & Explanation
Answer |
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2 |
Explanation |
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Split the diagram into 3 vertical columns. The sum of the numbers in each column equal 17. |

View Answer & Explanation
Answer |
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31 |
Explanation |
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As you move to the right, double the previous number and subtract 4, then 3, then 2, then 1 to give the next number along. |

View Answer & Explanation
Answer |
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7 |
Explanation |
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Start anywhere on the diagram, and move clockwise, calculating the sum of every third circle. This always equals 15. |
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