Related Clues:

• Throws into the mix
• Continues, conversationally
• Does simple math
• Joins in
• Reckons
• Puts into the mix
• Puts in extra
• Keeps talking
• Stirs in
• Does arithmetic
• Tosses into the mix
• Keys in
• Finds 23-Down
• Puts in the mix
• Gets to the bottom of things?