Multiplication, decimals, Powers of 10, Rounding, Estimating

Double Digit Multiplication

100

25*9

225

200

33*88

2904

300

742*8

5936

400

128*43

5504

500

7128*15

106,920

Multiplication with Decimals

100

0.08*0.6

.048

200

If you know that 23*48 is 1104 

Solve 23*4.8

110.4

300

97*0.04

3.88

400

0.92*0.8

0.736

500

8.5*8.5

72.25

Rounding

100

Round to the nearest 10

46

50

200

Round to the nearest 100

234

200

300

Round to the nearest tenth

0.91

.90

400

Round to the nearest hundredth

0.618

0.62

500

0.609 rounded to 0.600

What place was the number rounded to?  

Rounded to the nearest tenth 

Powers of 10

100

9*10²

900

200

7*10³

7*10⁴

7000

70000

300

0.49*10¹

4.9

400

0.84*10³

840

500

0.84*P=84

What power of 10 did you multiply by?

P=10²

Estimating

100

Estimate first and then find the real answer

24*39

Estimate answer 800 or 1000

Exact 936

200

Estimate First and then find the exact answer

151*32

Estimated answer: 4500

Exact answer: 4832

300

Estimate First and then give the exact answer

0.74*0.2

Estimate answer: 0.140 or 0.14

Exact Answer: 0.148

400

Estimate first and then find the exact answer

12.3*3.7

Estimate Answer:48

Exact Answer: 45.51

500

Estimate to the nearest whole number and then find the exact answer

15.2*5.3

Estimate Answer:75

Exact Answer:80.56