Addition
Subtraction
Multiplication
Division
Decimals
100

7+9

16

100
12-4

8

100

2x5

10

100

12/4

3

100

Estimate roughly what 2.63x5 is

10 or 15

200

23+12

35

200

33-11

22

200

12x4

48

200

20/5

4

200

Estimate roughly what 8.98x7 is

63 or 56

300

104+64

168


300
150-24

126

300

25x10

250

300

77/7

11

300

Estimate roughly what 6.28x 20 is

120 or 140

400

255+281

536

400

390-125

265

400

137x38

5206

400

135/9

15

400
Estimate roughly what 15.76x15 is

225 or 240

500

1278+339

1617

500

1588-523

1065

500

1258x109

137,122

500

450/25

18

500

Estimate roughly what 150.35x 10 is

1500 or 1600

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