Related Clues:

• Put two and two together, say
• State further
• Chime in
• Work with a calculator, in a way
• Do some math
• Do the math, maybe
• Speak further
• Bring to the mix
• Contribute to the pot
• Total (up)
• Toss into the mix, e.g.
• Put together with
• Find a sum
• Interpose
• Supplement (with ''to'')