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adding
subtracting
muiptupchtiom
100
5+5
10
100
10-9
1
100
10times9
90
200
10+7
17
200
7-6
1
300
7+0
7
300
8-8
0
400
90+7
97
400
4-1
3
500
40+4
44
500
3-1
2