for squaring sums, do they addition first and then square.
ex: (3+5)squared = (8)squared or 64
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The rule to decide if a number is divisible by 9 is to look at the sum of the digits. If the sum of the digits is divisible by 9, then so is the number.
The sum is positive.
Is the sum of the digits a multiple of 9?
The sum of all (interior) angles must equal 360 degrees
It isthe number must end in 0 or 5, andthe sum of the digits (and the sum of the digits of that sum and so on), must be 9.