They are: 3*3 = 9 and 2*2*3 = 12
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2*2*5*5
99 = 32 x 11
2 x 3 x 5
By dividing your number by prime numbers until all the factors are prime. 210 105,2 35,3,2 7,5,3,2
The prime factors of 12 are 2 x 2 x 3. The prime factors of 15 are 3 x 5.