## Three tricks division can do

Frequently, in these modules and in your biology classes, you will be asked to make a variety of calculations involving division. No, we’re not going to go into doing long division – you do get to keep your calculator. However, division is still a rather tricky subject, and one that often gets students in trouble. The question is:

What gets divided by what?

Luckily, there’s a very simple answer:

It depends.

Specifically, it depends on what you’re trying to do with the division. But there are a number of “flavors” of division that I list below – most of the time, what you’re trying to do will fall into one of them.

- Ratios
- Percent, Proportion, or Probability
- Percent Change

We’ll go through each of these options. By the end, you should feel confident making a given calculation without consulting your TA – and you should also feel confident choosing which calculation fits a given situation.

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