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You can multiply 2 and 9 to get 18. Alternatively, you can multiply 3 and 6 to get 18 as well.
Multiply 4 to 18, and 3 to 24. You get a denominator of 72
3x6
Presumably, the theory is that it's easier to multiply by small numbers than larger ones. If there's a number that you need multiplied by 18, multiply it by 3, then multiply that total by 3, then multiply that total by 2.
They are: 1*18 = 18, 2*9 = 18 and 3*6 = 18