1, 2 & 4.
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Multiples of 12 are 12, 24, 36, 48, etc. Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36. Numbers that are multiples of 12 and factors of 36 are 12 and 36.
The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, and 36.The prime factors of 36 are: 2 and 3.
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36.The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40.
In order to find the common factors of 2 numbers, it is easiest to first list their factors. The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18 and 36 The factors of 24 are: 1, 2, 3, 4, 6, 8, 12 and 24. The common factors are the numbers that appear in both lists. These are 1, 2, 3, 4, 6 and 12.
Oh, dude, the highest common factor (HCF) of 12, 20, and 36 is 4. So, like, if you're looking for the biggest number that can divide all three of those numbers without leaving a remainder, it's 4. Easy peasy, right?