How do recipes relate to math?

Answer 1

Recipes relate to mathematics is two respects. The first is in the context of ratios and proportions. Mathematics can enable to help you work out the amount of ingredients required to cater to a larger or smaller number of portions.

Second, a recipe is a form of algorithm which is an aspect of decision theory. This is the study of formalising procedures to arrive at the desired outcome.

Answer 2

It helps you determine how much of a batch or something you can actually make so you don't waste ingredients. It also helps make sure you don't have too much of one item.