As a product of its prime factors: 2*3*3*7 = 126
ladder method
*)1 3)3 3)9 2)18 2)36 2)72 The prime factorization of 72 is 2 x 2 x 2 x 3 x 3.
It is: 2*2*7 = 28
It is: 2*5*5*5 = 250
As a product of its prime factors: 2*3*3*7 = 126
ladder method
31 is already prime; no method required.
*)1 3)3 3)9 2)18 2)36 2)72 The prime factorization of 72 is 2 x 2 x 2 x 3 x 3.
139 is already prime; no factorization required.
ewan
145 5,29
it is fast and easy
It is: 7*7 = 49
*)1 5)5 3)15 2)30 The prime factorization of 30 is 2 x 3 x 5.
The concept of "prime factorization" is used for integers. It doesn't make sense to use it for fractions or decimals.
2, 5 and 7