What is 10% of 120? It's hard idk.?

10% of 120 is 12.

(10/100) * 120

It's not hard if remember a couple of things that you should have learned / before you ran into this problem. Here they are:

1). ' 10% ' means 10/100, or 0.1

2). In middle school math,"of" almost always means "times".

Now that you know those two things, you can use them to re-write the problem:

" 10% of 120 " means " 0.1 times 120 ".

I'm sue you can solve that.