Related Clues:

• Sum things up
• Calculate the sum of
• Solve a KenKen puzzle, say
• Do first-grade math
• Make 4 from 2 and 2
• "Figure it out"
• "This doesn't ___ up"
• "Figure it out, Einstein!"
• Count and combine
• Make a number from 2 smaller ones
• Hit "+" on a calculator
• Combine digits
• __ insult to injury
• Make five from two and three
• Put on your friends list