x3
rounding to the nearest 10
x4
Mental Math
Place Value
100

3x4

12

100

123

120

100

4x2

8

100

40x50

2000

100

Hundred place?  1,345

300

200

3x7

21

200

44

40

200

4x4

16

200

30x7

210

200

thousands place  35,674

5,000

300

5x3

15

300

267

270

300

6x4

24

300

800x2

1600

300

ten thousand place    198,897

90,000

400

9x3

27

400

555

560

400

9x4

36

400
90x30

2700

400

hundred thousands place     1,545,678

500,000

500

12x3

36

500

945

950

500

11x4

44

500

900x4

3600

500

millions place        4,678,101

4,000,000

M
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