To find common factors, you first need to break the numbers up into their prime factors:
9=3x3
100=2x2x5x5
The next step would be to identify the common prime factors. In this case we can see that there are none, and thus the HCF, and indeed the only number that goes into both 9 and 100, is 1.
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13 goes into 100 7 times with a reminder of 9. This obtained by dividing 100 by 13.
9 goes into 100 ten times. 117 - 90 = 27. 9 goes into 27 three times. 10 + 3 = 13 117 divided by 9 = 13
9.0909090909090909090909090909091 times
What goes in 100 equally
25 goes into 100 and 75.