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What is the greatest common factor of 90 and 105?
The GCF of 90 and 105 is 5. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The factors of 105 are 1, 3, 5, 7, 15, 21, 35, and 105. The common factors are 1, 3, 5, and 15. Therefore, the greatest common factor is 15. The greatest common factor can also be determined from the prime factors, multiplying the common prime factors together. The prime factors of 90 are 2, 3, 3, and 5. The prime factors of 105 are 3, 5, and 7. The common prime factors are 3 and 5, so the greatest common factor is 3 x 5 = 15.
Which pime factors do 75 and 90 have in common?
3 and 5
What the multiples of 15?
15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, . . .
What are the multiples of 5 starting at 75?
75, 80, 85, 90, 95, 100, 105 and just keep adding 5 until you get to infinity.75, 80, 85, 90, 95, 100 and just keep adding five until you get to infinity.
Factors of 90 and 105?
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 1, 3, 5, 7, 15, 21, 35, 105
