• Abacus activity

• Accountant's work

• Annexing

• Calculating endeavor

• Calculator job

• Child's arithmetic lesson

• Doing sums

• Doing the math, maybe

• Early arithmetic skill

• Hitting the + key

• Increasing

• Kind of machine

• Making two and two four

• Performing a simple operation

• Putting in

• Simple arithmetic

• Sum problem?

• Summing

• Tacking on

• Throwing in

• Totaling

• Toting up

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