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Q: What are the common factors and common prime factors of 40 and 70?

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2 and 5

2 and 5

The common factors of 40 and 70 are 1, 2, 5, 10

The prime factors of 18 are 2, 3, and 3. The prime factors of 70 are 2, 5, and 7. The prime factors that 18 and 70 have in common are a single 2.

For 40: 2 and 5 For 70: 2, 5 and 7

40: 2, 5 70: 2, 5, 7

The prime factors of 70 are 2, 5, and 7. The prime factors of 90 are 2, 3, 3, and 5. The prime factors that 70 and 90 have in common are 2 and 5. The greatest common factor of 70 and 90 is the product of the prime factors they have in common, so it is 2 x 5 = 10.

The common factors are: 1, 2, 5, 10.

Five

2 and 5

Common factors are 1, 2, 5, & 10

70 is a composite number because it has factors other than 1 and itself. It is not a prime number. The 8 factors of 70 are 1, 2, 5, 7, 10, 14, 35, and 70. The factor pairs of 70 are 1 x 70, 2 x 35, 5 x 14, and 7 x 10. The proper factors of 70 are 1, 2, 5, 7, 10, 14, and 35 or, if the definition you are using excludes 1, they are 2, 5, 7, 10, 14, and 35. The prime factors of 70 are 2, 5, and 7. The 3 distinct prime factors (listing each prime factor only once) of 70 are 2, 5, and 7. The prime factorization of 70 is 2 x 5 x 7. NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.

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