add
10+51=
61
10-10=
0
2!
2x1=2
200+70=
270
100-21=
79
10/2=
5
3!
3x2x1=9
1000+3000=
4000
10000-1000
9000
12x12
144
4!
4x3x2x1=24
10020+30020=
40040
100-99=
1
5!
5x4x3x2x1=120
100000+200001
300001
500-500
0
100x100=
1000
6!
6x5x4x3x2x1=720