Rounding and Mental Maths

Addition

100

12 + 7

19

200

23 + 19

42

300

16 + 5 + 19

40

400

126 + 251

377

500

23 + 49 + 367

439

Subtraction

100

17 - 9

8

200

25 - 17

8

300

64 - 28

36

400

300 - 194

106

500

710 - 243

467

Rounding to nearest 10

100

23

20

200

45

50

300

238

240

400

303

300

500

1057

1060

Rounding to nearest 100

100

63

100

200

230

200

300

350

400

400

1750

1800

500

23055

23100

Rounding to nearest whole number

100

11.1

11

200

13.5

14

300

2.69

3

400

17.18

17

500

239.3

239