Related Clues:

• 1 + 2 + 3, e.g.
• Simple math problem
• It may be tidy
• Arithmetic total
• Zero- --- game
• Arithmetic exercise
• Tally up
• Addition solution
• The Zero-___ Theory
• Total amount
• Latin 22-Across
• Latin 51-Across
• 'Cogito, ergo --'
• Dim follower
• Substance companion