Divide the number by one of the known factors. Then divide the quotient by another factor. Continue with all the known factors. What you are left with at the end is the missing factor.
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It is the smallest factor of one (or more) of the multiplicands.
0.11
n = 70/5 n = 14
Find out about factors and factor trees.
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.