Related Clues:

• Perform a simple operation?
• Solve KenKen, say
• Compute a sum
• Work out a sum
• Do some basic arithmetic
• Join in broad daylight
• Put three and eight together
• Obey a plus sign
• Put these three with those eight
• Do "sum" math?
• Use a sign
• Do really basic math
• Use an abacus, perhaps
• Count this with that
• Do "sum" calculations