Oh, dude, it's like this. So, if you wanna multiply 6 by 7 using doubling, you can think of it as doubling 6 seven times or doubling 7 six times. Or, you know, you could just do the regular multiplication and get 42. But hey, whatever floats your math boat.
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To find 6x7 using 3x7, you can simply double the result of 3x7. This is because multiplication is distributive over addition, meaning that multiplying a number by a sum is the same as multiplying the number by each addend and then adding the products. In this case, 6x7 can be thought of as (3+3)x7, which equals 3x7 + 3x7, or 21 + 21, which equals 42.
You can use 4x7 to find 8x7 because 4 x 2 is 8, and you are simply doubling one of the numbers you are multiplying, (4 to 8) and so multiply your answer from 4x7 by 2 to get the answer to 8x7. 4x7 is 28 and 8x7 is 56, and 28 x 2 is 56.
You multiply 5x5 then 9x1.
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
Factors OR multiplicands.