1) Abstract 2) Calculate 3) Cipher 4) Compute 5) Cypher 6) Deduct 7) Figure 8) Make a subtraction 9) Reckon 10) Remove 11) Take 12) Take 2, clue 2 13) Take an amount away 14) Take away 15) Take away from 16) Take off 17) Take off or away 18) To remove or reduce 19) Withhold 20) Work out 1) Bate 2) Calculate 3) Deduct 4) Subduct 5) Takeaway 
• (v. t.) To withdraw, or take away, as a part from the whole; to deduct; as, subtract 5 from 9, and the remainder is 4.
When a number is taken away or remove from another number or group. Also can be the difference between two amounts or can be called minus. It is the opposite of adding.
Sub·tract' transitive verb [ imperfect & past participle Subtracted ; present participle & verbal noun Subtracting .] [ Latin subtractus , past participle of subtrahere to draw from beneath, withdraw, remove; sub un...
[v] - make a subtraction
to withdraw or take away, as a part from a whole. · to take (one number or quantity) from another; deduct.