You can multiply 2 and 9 to get 18. Alternatively, you can multiply 3 and 6 to get 18 as well.
324
Multiply 4 to 18, and 3 to 24. You get a denominator of 72
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
You can multiply 2 and 9 to get 18. Alternatively, you can multiply 3 and 6 to get 18 as well.
324
Multiply 4 to 18, and 3 to 24. You get a denominator of 72
If you meant what whole numbers can you use to multiply to 18, there's 9x2, 6x3, and of course 1x18 but you could multiply any number[s] to 18
you multiply 27 times a number then you multiply 18 times a different number and see if they come out with the same answer.
18
Multiply 18 by successive counting numbers.
Multiply 11 by 18 and multiply that total by 2 and 3.
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.
-18 and -18
270
The idea is to multiply 18 by 2, then divide the result by 6. As an alternative, you can also divide 18 by 6 first, then multiply the result by 2.