Restar
50-20=
30
35+35=
70
87-49=
38
112+114=
226
145+234=
379
55-21=
34
41+41=
56-55=
1
145+134+
279
456+432=
888
58-44=
14
45+45=
90
78-49
29
329+315=
14
326-315
11
89-86=
3
70+30=
100
112-110
2
723+144=
867
4,000-3,000=
1,000
90-60=
30
43+89=
132
46-38=
8
999+123
1,122
5,555-4,444=
1,111