To simplify fractions, it is necessary to divide the numerator and the denominator by their GCF. You can find their GCF by comparing their prime factorizations. You can find their prime factorizations through the use of factor trees.
90 45,2 15,3,2 5,3,3,2
35 5,7
1,3,5,15,25,75
655 5,131
8
The prime factorization.
550 275,2 55,5,2 11,5,5,2
It is the pie
4
630 315,2 105,3,2 35,3,3,2 7,5,3,3,2
48 24,2 12,2,2 6,2,2,2 3,2,2,2,2
by using a prime factor tree