Related Clues:

• Make a summation?
• Tally up
• Arithmetic directive
• Use a plus sign
• Mention as an afterthought
• Calculate sums
• Do some simple calculating
• Charity's urging
• Do a summer's work?
• Pledge drive word
• Give freely
• Compute, sometimes
• Provide free
• Write, as a P.S.
• Offer as a bonus