There are 11 nines in the numbers from 1 to 100: 9, 19, 29, 39, 49, 59, 69, 79, 89, and 99.
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The GCF of all the composite numbers under 100 is 1. For e.g 4 & 9 are composite numbers & their GCF is 1, so if we take other composite numbers along with 4 & 9 the GCF will be 1.
1, 4, 9, 16, 25, 36, 49, 64, 81, 100
There are 720 of them. The three digit counting numbers are 100-999. All multiples of 5 have their last digit as 0 or 5. There are 9 possible numbers {1-9} for the first digit, There are 10 possible numbers {0-9} for each of the first digits, There are 8 possible numbers {1-4, 6-9} for each of the first two digits, Making 9 x 10 x 8 = 720 possible 3 digit counting numbers not multiples of 5.
numbers 1-9 is the answer
Prime squares: 4, 9, 25 and 49