Show:
Rounding to the nearest 10
Rounding to the nearest 100
Adding and subtracting 2-digit numbers
Adding 3 digit numbers
Subtracting 3 digit numbers
100

32

30

100

57

100

100

56+46

102

100

271+299

570

100

246-178

68

200

87

90

200

251

300

200

81-27

54

200

339+225

564

200

350-218

132

300

155

160

300

798

800

300

99+53

152

300

434+392

826

300

517-189

328

400

1,262

1,260

400

2,545

2,500

400

82-68

14

400

558+344

902

400

761-623

138