Related Clues:

• Do some basic math
• Join old man, heading some way back
• Obtain a sum
• "That doesn't ___ up"
• 'It just doesn't ___ up'
• Antonym of ''remove''
• "Figure it out!"
• Do simple computations
• Comment further
• Perform an operation
• Include in the mix
• Antonym of ''throw out''
• Reach a total, in a simple way
• Make a U-turn from subtract
• Enhance, with ''to''