Show:
Round to the nearest 10
Round to the nearest 100
Adding 4 numbers
Adding 3 digit numbers
Subtraction
100

78

80

100

495

500

100

15+29+15+13

72

100

709+158

867

100

244-204

40

200

34

30

200

701

700

200

27+12+48+12

99

200

730+299

1,029

200

658-104

554

300

29

30

300

379

400

300

22+12+16+45

95

300

137+461

598

300

867-535

332

400

115

120

400

733

700

400

13+48+18+19

98

400

771+330

1,101

400

577-264

313

500

354

350

500

999

1,000

500

12+34+40+13

13

500

950+480

1,430

500

716-603

113