What is the crossword answer for the clue: Do the math

ADD - a 3 letter word may be the answer you are looking for!

ADDUP - a 5 letter word may be the answer you are looking for!

CIPHER - a 6 letter word may be the answer you are looking for!

CALCULATE - a 9 letter word may be the answer you are looking for!

Do the math

3 Character Answers:

ADD

5 Character Answers:

ADDUP

6 Character Answers:

CIPHER

9 Character Answers:

CALCULATE