Understanding Ratios and Comparisons

A recipe calls for 3 cups of flour for every 2 cups of sugar. What is the ratio of flour to sugar?

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VA.6.PFA.1.a

In a classroom, there are 12 boys and 16 girls. What is the ratio of boys to girls in the classroom?

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VA.6.PFA.1.b

A car travels 150 miles using 5 gallons of gasoline. What is the ratio of miles to gallons?

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VA.6.PFA.1.a

If a fruit basket contains 8 apples and 12 oranges, what is the ratio of apples to the total number of fruits?

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VA.6.PFA.1.c

A school has 200 students, and 50 of them are in the band. What is the ratio of students in the band to the total number of students?

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VA.6.PFA.1.c

A box contains 10 red marbles and 15 blue marbles. What is the ratio of red marbles to blue marbles?

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VA.6.PFA.1.b

In a garden, there are 18 roses and 24 tulips. What is the ratio of roses to the total number of flowers?

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VA.6.PFA.1.c

A train travels 240 miles in 4 hours. What is the ratio of miles to hours?

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VA.6.PFA.1.a

What is a Ratio?

• Is a comparison of two quantities 
• A rate with a denominator of one
• It is when the only factor the numerator and denominator share is a one 
• Two decimals that can be multiplied

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CCSS.3.NF.A.1

CCSS.3.NF.A.2

CCSS.3.NF.A.3

Define a Proportion?

• A proportion is an equation that states that two ratios are equal.
• A proportion is a graphical representation of data.
• A proportion is a method of calculating percentages.
• A proportion is a type of fraction that cannot be simplified.