Maths problem of the week

Image result for square

A square has sides that are in whole cm. Which of the following measurements cannot be its perimeter?

21cm, 52 cm, 36cm, ,40cm

Explain your thinking.

3 thoughts on “Maths problem of the week


  1. • 21 cm is the odd one because 21/4=5 1r left .
    array

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    .

    • its because there is 1 left over.

    Proved

    36/4 =9
    40/4=10
    52/4=13
    21/4=5 1r

    Like

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