addition subtraction
100
What is 10+10
20
200
What is 6+1
7
200
What is 6-10
4
300
What is 2+7
9
300
What is 7-9
2
400
What is 8+9
17
400
What is 24-4
20
500
What is 20+20+8
48
500
What is 16-1-1-1-1-1-1
10






add+subtract

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