100's
100+300=???
400
1+2=????
10+10=????
20
20-1=????
19
100+11=????
111
200+400=????
600
3+3=????
6
20+20=????
40
30-20=????
10
200+22=????
222
600
3+6=????
30+30=????
60
30-10=????
20
300+33=????
333
100+200=????
300
1+4=????
5
30+60=????
90
40-20=????
20
400+44=????
444
400+200=????
600
9+1=????
10
50+50=????
100
11-2=????
9
500+56=????
556