Question

What is equivalent to 1/40

Answer 1

Any number like 12 that you multiply both the top and bottom of a fraction will yield a fraction that is the same to the fraction you multiplied before.

I am going to pick 10 because it is easy to multiply with it in your head.

1/40 * 10/10 = 10/400

And we have 10/400. Which it is equal to 1/40.

Answer 2

2/80 is equivalent 
you can also just multiply the numerator and denominator to find out what else is equivalent.