Show:
Adding within 100
Subtracting within 100
Adding within 1,000
Subtracting within 1,000
Mixed
100

7 + 15

22

100

17-15

2

100

113+112

225

100

432-221

211

100

8+14

22

200

42+19

61

200

21-7

14

200

118+113

231

200

331-119

212

200

31+15+17

63

300

53+17

70

300

33-17

16

300

236+448

684

300

412-113

299

300

48+49

97

400

45+16

71

400

45-36

9

400

545+356

901

400

547-395

152

400

959-766

193

500

69+28

97

500

81-35

46

500

392+198

590

500

576-489

87

500

386+287

673