Multiplying and Dividing Decimals

Multiplying Decimals

100

What is 19.32 x 100?

1,932

200

What is 98.4 x 0.43?

42.312

300

What is 66.92 x 9.9?

662.508

400

What is 3.02 x 5.7?

17.214

500

What is 19.8 x 6.74?

133.452

Dividing Decimals

100

What is 6.73 divided by 100?

0.0673

200

What is 19.9 divided by 10.2 rounded to the nearest hundredth?

1.95 when rounded to the nearest hundredth

(1.95098039)

300

What is 89.6 / 0.3 rounded to the nearest tenth?

298.7 when rounded to the nearest tenth 

(298.666667)

400

What is 35 / 7.02?

4.99 when rounded to the nearest hundredth

(4.98575499) 

500

What is 93.4 / 5.7?

16.3859649, or 16.39 when rounded to the nearest hundredth

Word Problems

100

Kacey is baking. A recipe requires 6.8 cups of flour to make a serving. She only wants to make 0.8 of the recipe. How many cups does she need?

She needs 5.44 cups. You do 6.8 x 0.8 because she is only cooking part OF the recipe. 0.8 is less than 1 whole, so your answer needs to be smaller than the total, which was 6.8.

200

Trick is designing his car for science class. He made the car 2 feet long (woah!). He wants to put a light bulb every 0.4 feet. How many light bulbs should he use?

5 light bulbs. You do 2 divided by 0.4 because you are SPLITTING the car into EQUAL sections. Try drawing it if this did not make sense to you! :)

300

Chris has 6 mini candy bars. Each candy bar is 1.37 cm. If he lays them end-to-end, how many cm would it be in all?

8.22 cm because you multiply because you are PUTTING TOGETHER EQUAL GROUPS! Draw it if you are having trouble with this! :)

400

Albie is making goody bags for his birthday party. He needs to separate 8.4 pounds of candy into 0.7 pound piles. How many goody bags can he make with this?

12 goody bags -- You do division because you are SPLITTING the candy into EQUAL groups!

500

Mrs. Krueger's 5th graders are selling treats at a bake sale. The students sell the following amount of treats: 16 cookies (each costs $0.53), 23 brownies  (each costs $1.25),  and 13 cake pops (each costs $0.68). How much money did they make in all?

In total, they made $46.07. The cookies cost $8.48, the brownies cost $28.75, and the cake pops cost $8.84. 

You find this by multiplying how many they sold by how much each one costs. After adding them all, you get the total answer.

Adding and Subtracting Decimals

100

What is 2.4 + 17.83?

20.23

200

What is 60 - 7.83?

52.17

300

Olivia walked 6.67 miles. Then she walked another 0.7 miles. How many miles did she walk in all?

7.37 miles

400

It rained 1.4 inches on Monday. On Tuesday, it rained .68 inches less than on Monday. How much did it rain on Tuesday?

It rained 0.72 inches on Tuesday.

500

Alexa bought 8.63 ounces of chocolate chips. The next day she baked cookies and used 1.9 ounces of them. How many ounces does she have now?

Alexa has 6.73 ounces left.

Mixed Questions

100

How many decimal places will there be in the product shown below? 2.4 x 19.52 =

3 because you move the decimal point out three spaces. The answer to 24 x 1952 = 46848 (with a hiding decimal point next to the ones place), and then you move the decimal back three spaces to 46.848.  This makes sense because the problem is similar to the estimate 2 x 20 = 40.

200

What factor could be used to make the equation true? ______ x 0.09 = 0.324 

A) 1.5 

B) 2.8 

C) 3.6 

D) 2.2

C: 3.6
3.6 x 0.09 = 0.324 

You can just try all of the answer choices, or just divide 0.324 by 0.09.

300

What is 1/1000 of 63.67? 

0.06367

400

Sarah and Isabella went to Starbucks for lunch. To determine how much money to leave as a tip, they multiplied the bill by 0.15 (This would be a 15% tip). How much money should she leave as a tip if the bill is $20?

$3 because 0.15 x 20 = 3.00. The product is smaller than 20 because you are only taking a PART of it (less than 1 whole).

500

What is 763 x 925?

705,775