Related Clues:

• Sums it up
• Folds in
• Mixes in
• Foots a column
• Find a sum
• Makes sense, with "up"
• Calculates the total
• Does some remedial math
• Does the math
• Includes later
• Counts
• Finds a sum
• Finds a 50 Across
• Does sums
• Finds the total