| Contribute (to) | 15 |
| Calculate sums | 14 |
| Work with numbers, in a way | 27 |
| Work with a calculator, in a way | 32 |
| Word in math class | 18 |
| Violent Femmes: "___ It Up" | 37 |
| Violent Femmes "___ It Up" | 36 |
| Verb used in recipes | 20 |
| Tot up | 6 |
| Toss into the mix, e.g. | 23 |
| Tag on | 6 |
| Tack on a few extra | 19 |
| Speak further | 13 |
| Put two and two together, say | 29 |
| Put more in | 11 |
| Postfix | 7 |
| Perform an operation? | 21 |
| Offer as a bonus | 16 |
| Lengthen (with ''to'') | 38 |
| Join to | 7 |
| Interpose | 9 |
| Have sum fun? | 13 |
| Get to the bottom line | 22 |
| Focusing problem, for short | 27 |
| Find the total | 14 |
| Factor a sum | 12 |
| Do the math, in a way | 21 |
| Do numbers | 10 |
| Do figuring | 11 |
| Do basic math | 13 |
| Do basic arithmetic | 19 |
| Contribute to the conversation | 30 |
| Compute a total | 15 |
| Combine numbers | 15 |
| Combine figures | 15 |
| Cause an increase | 17 |
| Calculate the total | 19 |
| Calculate column totals | 23 |
| Bring to the table | 18 |
| Attach (to) | 11 |
| Write, as a P.S. | 16 |
| Write in a postscript | 21 |
| Write a P.S., e.g. | 18 |
| Work on one's figures? | 26 |
| Work on columns | 15 |
| Word near the bottom of a dipstick | 34 |
| Word heard in math class | 24 |
| Word found on a dipstick | 24 |
| What you must know how to do to solve a kakuro puzzle | 53 |
| Utter parenthetically | 21 |
| Use carets | 10 |
| Use a '+' | 17 |
| Total up | 8 |
| Thing one can do on one's fingers | 37 |
| Tendency for one's mind to wander, for short | 48 |
| Tally one's scorecard | 25 |
| Tack (on) | 9 |
| System of a Down song off "Steal This Album!" | 55 |
| System of a Down song about math? | 33 |
| Supplement (with ''to'') | 40 |
| Solve some KenKen, say | 22 |
| Say in a postscript | 19 |
| Say "Furthermore ...," say | 36 |
| Run numbers? | 12 |
| Ritalin treats it: Abbr. | 24 |
| Ritalin target: Abbr. | 21 |
| Reason to prescribe Ritalin, briefly | 36 |
| Raise, with "to" | 26 |
| Put into the mix | 16 |
| Put a wing (on) | 15 |
| Provide extras | 14 |
| Problem in focusing, for short | 30 |
| Perform an certain operation | 28 |
| Perform an arithmetic operation | 31 |
| Parenthetically mention | 23 |
| Opposite of unfriend | 20 |
| Offer an afterthought | 21 |
| Obey the plus sign | 18 |
| Mix (in) | 8 |
| Mention parenthetically | 23 |
| Mention as an afterthought | 26 |
| Make a summation? | 17 |
| Lengthen, with “to” | 27 |
| Lengthen (with "to") | 30 |
| Lack of focus, colloquially | 27 |
| Just-water connection | 21 |
| Increase, with "to" | 29 |
| Increase (with "to") | 30 |
| Include, with "in" | 28 |
| Inability to stay focused, briefly | 34 |
| Hyperactivity may be a sign of it, for short | 44 |
| Hook up with, on Facebook? | 26 |
| Gibe, with "up" | 25 |
| Get sumwhere? | 13 |
| Get sum? | 8 |
| Generate a summation | 20 |
| Form a sum | 10 |
| Find a total | 12 |
| Engage in a summer activity? | 28 |
| Do sumthing? | 12 |