Related Clues:

• Does sum work
• Does basic math
• Increases (with "to")
• Puts on the pile
• Inscribes, e.g.
• Walks on stage
• Keyboards, maybe
• Partner of breaks
• Signs up for, as a contest
• Does a certain math problem
• Opposite of subtracts
• Infiltrates, say
• Finds a total
• Chimes in
• Comes through the door