addition
800+400=
1'200
56-40=
16
40x1=
40
14
+4
18
514x1
514
4+45=
49
10-12=
-2
40x2=
80
123
+3
126
123+56
179
19+14=
33
400-12=
388
4x4
16
23
+60
83
45-46
-1
64+4
68
17-12=
5
5x5=
25
456
x1
456
5x5+2-1
26
167-13=
154
800-400=
400
10x2=
20
123
x2
246
234
-235
-1