Related Clues:

• Find a sum
• Interpose
• Supplement (with ''to'')
• Contribute to the conversation
• Like bonuses
• Dipstick word
• Just-water connection
• Write a P.S., e.g.
• Perform an certain operation
• Attach (to)
• Calculate the sum
• Did some arithmetic
• Tossed in
• Problem in focusing, for short
• Calculate a total