Related Clues:

• Total (up)
• Toss into the mix, e.g.
• 1 + 2 + 3, e.g.
• Put together with
• Find a sum
• Interpose
• Supplement (with ''to'')
• Contribute to the conversation
• Simple math problem
• Dipstick word
• It may be tidy
• Just-water connection
• Write a P.S., e.g.
• Perform an certain operation
• Attach (to)