Adding W/O Regrouping
46+31=
77
45+38
83
84-31=
53
45-38=
7
67+22=
22+75=
97
87+42=
129
76-25=
51
94-29=
65
514+86=
600
143+12
155
168+56=
224
458-36=
422
512-68=
444
212-76=
136
314+475=
789
557+239=
796
936-702=
234
783-774
9
1,000-500=
500
763+236=
999
712+259=
971
999-835=
164
900-627=
273
956+44=
1,000