Download - Squared numbers
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These numbers can be arranged
to look like squares:
1, 4, 9, 16, 25, 36, 49, 64, 81, 100,
…
A curious propertyappears when we
subtract a squarednumber from its
successor :4 – 1 = 39 – 4 = 516 – 9 = 7
25 – 16 = 9, …The drawing shows
you why!
These numbers can
be arranged to look
like triangles:
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, …
A curious property appears when we
add two successive trianghular
numbers: the result is always a squared
number!
1 + 3 = 4 3 + 6 = 9
6 + 10 = 1610 + 15 = 25, …