Related Clues:

• Figure a sum
• Interject
• Way to check the check
• What summers do
• Go figure?
• Do sumthing?
• Lengthen (with ''to'')
• Perform an operation?
• Write further
• Utter parenthetically
• Compute
• Do sum math?
• Contribute (to)
• Put two and two together, say
• State further