Related Clues:

• Increases (with "to")
• Puts on the pile
• Does a certain math problem
• Opposite of subtracts
• Finds a total
• Chimes in
• Calculates a total
• Performs basic arithmetic
• Tots up
• Gets to the bottom line
• Uses the "+" function
• Chimes in with
• Does sum things
• Extends, with "to"
• Make bigger