Lesson Math

Multiply Rational Numbers

By Anna Perez

​Day 2:

​How to multiply with decimals:

​Work:

​Look for the keyword

of tells you that you are going to multiply by the fraction​

Multiple Choice

A recipe for carrot cake requires $$\frac{5}{6}$$ cup of sugar. Juan want to make $$\frac{3}{4}$$ of the recipe. How many cups of sugar should Juan use to make the recipe? Make sure to simplify

• $$\frac{5}{24}$$  

• $$\frac{5}{8}$$  

• $$\frac{4}{5}$$  

• $$\frac{2}{15}$$  

​You can use the 3-line strategy to find out if you multiply or divide

Drag and Drop

A bakery sells assorted bread for $3.75 a pound. If Mauricio wants to purchase $$3\frac{2}{5}$$  pounds of bread, how much would his total be?

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Drag these tiles and drop them in the correct blank above

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7

5

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​The keyword "times" is telling you that you are going to multiply the birth weight (5.45) times 2.5

Dropdown

Brandon purchased a cactus that was 5.27 inches tall. At the end of 3 years the cactus was 2 ½ times its original size. How much had the cactus grown at the end of the 3rd year. 

Select answer

​When multiplying by a fraction...

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if you multiply by a regular fraction you will get an answer less than the original value

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if you multiply by an improper fraction you will get an answer greater than the original value​

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if your fraction is equal to one your answer will be the same​

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Match

In the expression shown p represents a rational number

8p

Match the correct fraction to its keyword.

• $$\frac{5}{6}$$  

• $$\frac{19}{17}$$  

• $$\frac{7}{8}$$  

• $$\frac{16}{16}$$  

the product is less than 8

the product is greater than 8

the product is between and 8

the product is equal to 8

• the product is less than 8

• the product is greater than 8

• the product is between $$\frac{7}{8}$$ and 8

• the product is equal to 8

Dropdown

Which statement about 55 multiplied by

$$\frac{7}{4}$$ is true?​ ​

Select answer