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Is 1 the greatest common factor of 42 and 90?
No, it is 6. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The common factors are 1, 2, 3, and 6, so the greatest common factor is 6. You can also determine this by looking at the prime factors. The prime factors of 42 are 2, 3, and 7. The prime factors of 90 are 2, 3, 3, and 5. The prime factors they have in common are 2 and 3, so the greatest common factor is 2 x 3 = 6.
What number pair has a GCF of 3 and a LCM of 90?
The prime factorization of 90 is 2 x 3² x 5. There must be a 3 in one number and 3² in the other, and no other common prime factors; thus the number pair could be: 3 and 90 6 and 45 9 and 30 15 and 18
Common Factors of 15 and 90?
The common factors of 45 and 90 are 1,3,5
What is the least common multiple of 18 and 90?
The Least Common Multiple of 18 and 90 is 90.
Lcm of 18 and 30?
LCM is 90, which is the multiple of the highest power of prime factors in the given numbers (2 x 32 x 5).
