double digit addition
double digit subtraction
double digit regrouping
adding three numbers
add/sub tens
100
23+52
75
100
20-10=
10
100
45+65
110
100
123+123=
246
100
56-10=
46
200
45+43=
88
200
15-5=
10
200
83+46=
129
200
412+212
624
200
96-10=
86
300
12+63=
75
300
45-14=
31
300
35+35=
70
300
713+113=
826
300
75+10=
85
400
99+1
100
400
67-24
43
400
58+47=
105
400
510+210
720
400
55-10=
45
500
77+12=
89
500
100-50
50
500
98+56=
154
500
523+23
546
500
100+10=
110
M
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