Adding 2 on 2
+13
=40
120+436
=556
31-27
=4
333-222
=111
564-222
=342
36+12
=48
355+496
=851
61-49
=12
694-125
=569
264+634
=898
51+11
=62
687+135
=822
64-52
=12
854-654
=200
954-954
=0
19+45
=64
631+631
=1262
84-29
=55
888-621
=267
851+851
1702
66+24
=90
854+999
=1853
99-81
=18
765-231
=534
954-651+36
=339