sub ‧ tract /səbˈtrækt/ BrE AmE verb [transitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: past participle of subtrahere 'to pull from beneath, remove' , from trahere 'to pull' ]
to take a number or an amount from a larger number or amount ⇨ add , deduct , minus
subtract something from something
If you subtract 30 from 45, you get 15.