Use a factor tree.
70 Divide by two.
35,2 Divide by five.
7,5,2 Stop. All the factors are prime.
2 x 5 x 7 = 70
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Three:The Prime Factors of 70 are 2, 5, 7.
The prime numbers (factors) of 70 are: 2,5,7
The prime numbers (factors) of 70 are: 2,5,7
Prime factors of 70: 2, 5 and 7 Prime factors of 98: 2, 7 and 7
As a product of its prime factors: 2*5*7 = 70 Note that at least two or more numbers are needed to find their HCF