Multiplying Decimals prt2

Find the Product

100

4.1 x 0.5 = 

2.05

200

1.1 x 2.2 =

2.42

300

82.1 x 0.3 =

24.63

400

92.1 x 0.2

18.42

500

27.23 x 0.55 =

14.9765

Number Sense

100

Without multiplying, use your number sense to place the decimal point in the following problem.

6.79 x 8.12 = 5513

55.13

200

Without multiplying, use your number sense to place the decimal point in the following problem.

12.01 x 3.23 = 38792

38.792

300

Without multiplying, use your number sense to place the decimal point in the following problem.

4.99 x 4.99 = 249001

24.9001

400

What is the last step to multiplying decimals?

Put your decimal point back in the answer 

500

Without multiplying, use your number sense to place the decimal point in the following problem.

50.25 x 50.25 = 2525062

2,525.062

Find the Mistake

100

2.21 x 3 = 6.61

6.63

200

4.32 x 3 = 10.96

12.96

300

5.64 x 4 = 22.46

22.56

400

6.75 x 5 = 30.75

33.75

500

8.76 x 8 = 70.08

There is no error!

Multiply by Powers of 10

100

76.23 x 10³

76,230

200

4.32 x 10²

432

300

.079 x 10⁴

790

400

.765 x 10⁵

76,500

500

6.548 x 10³

6,548

Bonus

100

24.7 x 1/10²

.247

200

51.78 x 1/1000

.05178

300

Can you explain what this equation means and solve

.5 x 40

Half OF 40 = 20 

400

63.9 divided by 10²

.639

500

Without multiplying, use your number sense to place the decimal point in the following problem. (The digits in the answer are the correct digits.  Where would we place the decimal? 

2.75 x 3.31 = 8525

8.525