13 and 7
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Divide by the smallest primes, 2,3,5,7,11,etc.If it divides without a remainder then it is a factor.Take the quotient and continue factoring by primes.91/2 no91/3 no91/5 no91/7=1313 is prime therefore 91=7 x 13
1001 / 11 = 91 1001 is the smallest 4-digit number that 11 divides equally into.
1 divides into 121 and 42.
75.15 divides by 15.12 = 4.970238095238096