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The common factors of 30 and 40 are 1, 2, 5, 10
The Greatest Common Factor of 30, 40: 10
To find the HCF of 20 and 30, break them down into their prime factors: 20 = 2x2x5 30 = 2x3x5 The next step is to identify any common prime factors. In this case both numbers have a 2 and a 5 as prime factors. Multiply these together and you get: 2x5 = 10 Therefore the HCF of 20 and 30 is 10.
Well, darling, any pair of numbers that are multiples of 10 would work just fine. For example, 10 and 20, or 30 and 10. As long as 10 is the smallest number that both pairs can be evenly divided by, you're good to go. Math can be a real hoot sometimes, can't it?
The largest number that is a factor of both 20 and 30 is the greatest common factor (GCF) of the two numbers. To find the GCF, we need to determine the factors of each number. The factors of 20 are 1, 2, 4, 5, 10, and 20, while the factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The largest number that is common to both lists is 10, making it the largest factor of 20 and 30.