Mental Math
Estimation
Multiples of 10
Which place?
Divide
100

360/ 40

9

100

168/ 45

4

100

570/30

19

100

966/12

tens

100

224/16

14

200

270/ 90

3

200

525/96

5

200

420/20

21

200

6,310/53

hundreds

200

792/ 38

20 R32

300

2,100/ 30

70

300

373/62

6

300

530/30

18

300

728/ 91

ones

300

7,211/58

124 R19

400

4,800/ 80

60

400

61,329/93

7,000

400

840/60

14

400

612/69

ones

400

3,549/12

295 R9

500

200,000/50

4,000

500

748,976/92

8,000

500

849/90

9 R39

500

5,520/40

hundreds

500

2,941/28 

105 R1

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