Show:
Add/Subtract within 100
Add within 1000
Subtract within 1000
Add/Subtract 10 or 100
100
36 + 42 =
78
100
146 + 283 =
429
100
567 - 342 =
225
100
355 + 100 =
455
200
76 + 18 =
94
200
187 + 639 =
826
200
480 - 356 =
124
200
535 - 100 =
435
300
92 - 14 =
78
300
458 + 226 =
684
300
525 - 146 =
379
300
689 - 10 =
679
400
46 + 29 =
75
400
757 + 153 =
910
400
905 - 742 =
163
400
368 + 10 =
378
500
81 - 28 =
53
500
376 + 376 =
752
500
813 - 698 =
115
500
747 + 10 = and 747 - 10 =
757 737