2-digit subtraction
w/o regrouping
w/o regrouping
68-37
31
62-29
33
529+366
895
418+351
769
400+50+6
456
77-52
25
90-76
14
813+387
1,200
436+243
679
827
800+20+7
36-16
20
65-37
28
136+724
860
820+369
1,189
500+90+3
593
94-22
72
42-19
23
352+469
821
520+369
889
867
800+60+7
59-42
17
67-59
8
947+176
1.123
427+352
779
608
600+0+8