adding Subtracting
100
6
3+3
100
0
123,321,456,654-123,321,456,654
200
12
6+6
200
8
17-9
300
24
12+12
300
200
289-89
400
48
24+24
400
34
100-63
700
96
48+48
500
123,450,000
123,456,789-6,789






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