math

Divide a clock face with 1 straight line so that the sum of the numbers in each part are equal.

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  1. The sum S of the number of the clock face is the sum of the integers 1 to 12, where
    S = n(n+1)/2 = 12(12+1)/2 = 78
    If S is divided in two, each half should add up to 39.

    Now draw a picture of the numbers of the clock and see if you can circle numbers so that each group adds up to 39.

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