1:8 , 2:18 how do you cross multiply these

Question

1:8 , 2:18 how do you cross multiply these

Answer 1

To cross multiply, you multiply the first term of the first ratio by the second term of the second ratio, and then multiply the second term of the first ratio by the first term of the second ratio.

For the ratios 1:8 and 2:18:

First term of 1:8 x second term of 2:18 = 1 x 18 = 18
Second term of 1:8 x first term of 2:18 = 8 x 2 = 16

So, cross multiplying gives us:

18 and 16.