10+10=
What is 20
What is 0
How many ones are in the number 61?
What is 1
20+60=
What is 80
20-16=
What is 4
72+9=
What is 81
47-7=
What is 40
34+49=
What is 83
50-31=
What is 19
53+65=
What is 118
77-42=
What is 35
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