Doing arithmetic (numbers, addition, subtraction, multiplication, division)

Look at these examples:

Additions and subtractions

We use plus (plus) and moins (minus), and then égal (equal).

Note that in French we usually use the adjective égal (which refers to the mathematical sign =) in these phrases.
You can also use the verb égaler (to equal) or even faire:

Note that the preferred form for égaler (Académie Française...) is the singular égale, where we'll use the plural font for faire.

Multiplications

We can use fois (times) or multiplié par (multiplied by).

Divisions

We use divisé par (divided by).