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factor both then multiply the factors the number of times it was used in each number. 12=2x2x3 15=3x5 2x2x3x5=60 All multiples of 60 are divisible by 12 and 15.
Both 15 and 20 can go into 60, as they are both factors of that number.
The first number that 12 and 16 go into is 48.
It is 30
3 will go into both 15 and 27. 1 will go into any number, so also 1.