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I usually start by looking for the smallest factor. In this case, I know that 2 is a factor of 72 because 72 is an even number. Divide 72 by 2 to get 36. Now I know that 36 can be divided by 3 to get 12. Now put the 2 back in to get 24. So 72/3=24.
Apart from itself and 1, the only numbers that divide evenly into 221 are 13 and 17. Therefore, 221 = 13 x 17.
Apart from poor spelling, this question is based on a fallacy. Counting numbers and whole numbers are NOT the same. For example, -3 is a whole number but it is not a counting number.
no. 3 and 11 are prime numbers. 12 is not a prime number as it can be divided by other things apart from itself and one. these other numbers are 3, 4, 6 and 2.
4 squared is 16, so any numbers that are 16 apart. For example 46-30=16
well where i live the houses are 2 numbers apart but they can be 8 numbers apart its the way they was planned to be built the other numbers are oviously in a diffrent part of the estate. hope i helped :)