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What are the prime factors in common of 18 and 90?
The prime factors of 18 are 2, 3, and 3. The prime factors of 90 are 2, 3, 3, and 5. The prime factors they have in common are 2, 3, and 3. Since 18 is a factor of 90, its prime factors will be the prime factors that the two numbers have in common.
Common prime factors 18 81?
18 and 81 share only one prime factor: 3
Find the composite number the addition of whose prime factors is 18?
65, 77
What multiplication problems equal 18?
As a product of its prime factors: 2*3*3 = 18
What factors do 18 and 42 have in common?
The prime factors of 18 are 2, 3 and 3. The prime factors of 42 are 2, 3 and 7. Thus, the prime factors which are common to both are 2 and 3. However, the usual manner of answering this sort of question is to give the greatest common factor which is common to both (or all) numbers, and not only prime factors - so as 2 and 3 are common to both numbers and as 2 x 3 = 6 the 'other' answer to the question is 6.
