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Multiply by 10,100,1000
Divide by 10, 100, 1000
100

538 x 60 =

32,880

100

680 / 10 =

68

200

300 x 200 =

60,000

200

64,000 / 8,000 = 

8
300

659 x 300 =

197,700

300

241,000 / 1,000 = 

241

400

935 x 8,000 =

7,480,000

400

7,000 / 100 =

70

500

502 x100 =

50,200

500

1, 200 / 40 =

30