Add
4+5=
9
10-5=
5
1x8=
8
10+20=
30
100+200=
300
10+5=
15
10-4=
6
1x3=
3
20+20=
40
100+400=
500
11+5=
16
16-10=
6
2x4=
8
30+30=
60
200+100=
300
100+20=
120
120-20=
100
2x5=
10
10+60=
70
300+200=
500
120+40=
160
130-30=
10
2x6=
12
10+80=
90
200+400=
600