Rounding to nearest 100
mental multiplication
division
% of 100
subtraction
100

19890

19900

100

 

21 x 3 =

63

100

40/5

8

100

.80

80%

100

32 - 15=

17

200

62290

62300

200

12 x 3 =

36

200

72/9

8

200

.01

1%

200

2020 - 2019=

1

300

1983709

1982700

300

15 x 3 =

45

300

14/2

7

300

.50

50%

300

42 - 25=

17

400

135098

135100

400

21 x 2 = 

42

400

100/10

10

400

.70

70%

400

791 - 89=

702

500

1

0

500

88 x 4=

352

500

24/12

2

500

.30

30%

500

812 - 604=

208

M
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