1.  


9
10
11
12


Answer

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In each square of the diagram, the sum of the numbers is always 22.

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2.  


39
40
41
42


Answer

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Moving from left to right, numbers increase by 2, 3, 4 and 5.

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3.  


4
5
6
7


Answer

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The numbers in each row and column add up to 15.

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4.  


4
5
6
7


Answer

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Working in columns, the sum of the numbers in each column is always 14.

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5.  


1
2
3
4


Answer

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In each circle, the number in the lower left segment equals the sum of the numbers in the top two segments, and the number in the lower right circle equals the difference between the numbers in the top two segments.

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