Math Review

Inequalities (<, >, =)

100

2 tenths + 11 hundredths         0.13

                                   

    

                      

    

>

200

342 hundredths + 7 tenths        3 + 49 hundredths

>

300

0.3×10²+0.007×10³          0.3 × 10 + 0.7 × 10²                        

                                   

    

                                                             

    

<

Conversions

100

49 meters = _______ cm

4,900 cm

200

145.6 cm = ________ meters

1.456 meters

300

86.23 meters = _______ mm

86,230 mm

Multiplying Decimals

100

Using an area model, find the product of 4.6 and 3

13.8

200

Use an area model to solve: 3.14 × 7

21.98

300

Use an area model to solve: 9 × 5.48

49.32

Dividing Decimals

100

Use standard algorithm to solve: 4.236 ÷ 3

                                   

    

1.412

200

Use standard algorithm to solve: 17.45 ÷ 5

3.49

300

Use standard algorithm to solve: 16.404 ÷ 6

                                   

    

2.734

Word Problems

100

Dr. Mann mixed 10.357 g of chemical A, 12.062 g of chemical B, and 7.506 g of chemical C to make 5 doses of medicine.

About how much medicine did he make in grams? 

Hint: Estimate the amount of each chemical by rounding to the nearest tenth of a gram before finding the sum.

Dr. Mann made about 30 grams of medicine.

200

Dr. Mann mixed 10.357 g of chemical A, 12.062 g of chemical B, and 7.506 g of chemical C to make 5 doses of medicine.

Find the actual amount of medicine mixed by Dr. Mann. What is the difference between the estimate and the actual amount?

The difference is 0.075 grams.

300

Remember that there are 29.925 grams in all 5 doses.

How many grams are in one dose of medicine?

There are 5.985 grams of medicine in one dose.