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100
1+1
What is 2
100
4+4
What is 8
100
31+20
What is 51
100
45-5
What is 40
100
50-36
What is 24
200
20+20
What is 40
200
200+200
What is 400
200
45+45
What is 60
200
60-10
What is 50
200
45-35
What is 10
300
50+50
What is 100
300
40+50
What is 90
300
500-30
What is 470
300
56-37
What is 19
400
400+400
What is 800
400
60+40
What is 100
400
90+100
What is 190
400
56-54
What is 2
400
50-27
What is 22
500
70+40
What is 110
500
35+20
What is 55
500
600+400
What is 1000
500
50-45
What is 5
500
35-34
What is 1