Common Core: 6th Grade Math : Ratios & Proportional Relationships

Study concepts, example questions & explanations for Common Core: 6th Grade Math

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Example Questions

Example Question #11 : Ratios & Proportional Relationships

Candidate A receives \displaystyle 3 votes for every \displaystyle 1 vote that candidate B receives. At the end of the election candidate B has \displaystyle 900 votes. How many votes did candidate A get?

Possible Answers:

\displaystyle 1800

\displaystyle 900

\displaystyle 2700

\displaystyle 300

\displaystyle 100

Correct answer:

\displaystyle 2700

Explanation:

In order to solve this problem we need to create a ratio with the given information. It says that for every \displaystyle 3 votes cast for candidate A, candidate B got \displaystyle 1 vote. We can write the following ratio.

\displaystyle A:B\rightarrow\frac{A}{B}

Now substitute in the given numbers.

\displaystyle 3:1\rightarrow \frac{3}{1}

We know that candidate B received \displaystyle 900 votes. Write a new ratio.

\displaystyle A:900\rightarrow\frac{A}{900}

Now, use the original relationship to create a proportion and solve for the number of votes that candidate A received.

\displaystyle \frac{3}{1}=\frac{A}{900}

Cross multiply and solve for \displaystyle A.

\displaystyle 1(A)=900(3)

Simplify and solve.

\displaystyle A=2700

Example Question #774 : Ssat Middle Level Quantitative (Math)

Candidate A receives \displaystyle 7 votes for every \displaystyle 1 vote that candidate B receives. At the end of the election candidate B has \displaystyle 134 votes. How many votes did candidate A get?

Possible Answers:

\displaystyle 338

\displaystyle 839

\displaystyle 938

\displaystyle 389

\displaystyle 893

Correct answer:

\displaystyle 938

Explanation:

In order to solve this problem we need to create a ratio with the given information. It says that for every \displaystyle 7 votes cast for candidate A, candidate B got \displaystyle 1 vote. We can write the following ratio.

\displaystyle A:B\rightarrow\frac{A}{B}

Now substitute in the given numbers.

\displaystyle 7:1\rightarrow \frac{7}{1}

We know that candidate B received \displaystyle 134 votes. Write a new ratio.

\displaystyle A:134\rightarrow\frac{A}{134}

Now, use the original relationship to create a proportion and solve for the number of votes that candidate A received.

\displaystyle \frac{7}{1}=\frac{A}{134}

Cross multiply and solve for \displaystyle A.

\displaystyle 1(A)=134(7)

Simplify and solve.

\displaystyle A=938

Example Question #35 : Numbers And Operations

A motorcycle travels \displaystyle 195\ miles in \displaystyle 5\ hours. What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

\displaystyle 35mph

\displaystyle 39mph

\displaystyle 24mph

\displaystyle 43mph

\displaystyle 42mph

Correct answer:

\displaystyle 39mph

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 195\ miles: 5\ hours=\frac{195\ miles}{5\ hours}

Reduce and solve.

\displaystyle 39mph

Example Question #1 : Understand The Concept Of A Unit Rate: Ccss.Math.Content.6.Rp.A.2

A motorcycle travels \displaystyle 2035\ miles in \displaystyle 37\ hours. What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

\displaystyle 47mph

\displaystyle 57mph

\displaystyle 53mph

\displaystyle 45mph

\displaystyle 55mph

Correct answer:

\displaystyle 55mph

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 2035\ miles: 37\ hours=\frac{2035\ miles}{37\ hours}

Reduce and solve.

\displaystyle 55mph

Example Question #1 : Understand The Concept Of A Unit Rate: Ccss.Math.Content.6.Rp.A.2

A motorcycle travels \displaystyle 180\ miles in \displaystyle 3\ hours. What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

\displaystyle 30mph

\displaystyle 60mph

\displaystyle 66mph

\displaystyle 72mph

\displaystyle 90mph

Correct answer:

\displaystyle 60mph

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 180\ miles: 3\ hours=\frac{180\ miles}{3\ hours}

Reduce and solve.

\displaystyle 60mph

Example Question #2 : Understand The Concept Of A Unit Rate: Ccss.Math.Content.6.Rp.A.2

A motorcycle travels \displaystyle 360\ miles in \displaystyle 8\ hours. What is the motorcyclist’s speed in miles per hour (mph)?

 

 
Possible Answers:

\displaystyle 45mph

\displaystyle 34mph

\displaystyle 55mph

\displaystyle 47mph

\displaystyle 54mph

Correct answer:

\displaystyle 45mph

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 360\ miles: 8\ hours=\frac{360\ miles}{8\ hours}

Reduce and solve.

\displaystyle 45mph

Example Question #13 : Grade 6

A motorcyclist travels  in . What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

Correct answer:

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 2310\ miles: 55\ hours=\frac{2310\ miles}{55\ hours}

Reduce and solve.

Example Question #14 : Grade 6

A motorcycle travels  in . What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

Correct answer:

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 1445\ miles: 17\ hours=\frac{1445\ miles}{17\ hours}

Reduce and solve.

\displaystyle 85mph

Example Question #1 : Understand The Concept Of A Unit Rate: Ccss.Math.Content.6.Rp.A.2

A motorcycle travels  in . What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

Correct answer:

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 60\ miles: 1\ hour=\frac{60\ miles}{1\ hour}

Reduce and solve.

\displaystyle 60mph

Example Question #1 : Understand The Concept Of A Unit Rate: Ccss.Math.Content.6.Rp.A.2

 

 

A motorcycle travels  in . What is the motorcyclist’s speed in miles per hour (mph)?

Possible Answers:

Correct answer:

Explanation:

In order to find the motorcyclist’s speed, we need to create a ratio of the miles travelled in a single hour.

\displaystyle 723\ miles: 3\ hours=\frac{723\ miles}{3\ hours}

Reduce and solve.

\displaystyle 241mph

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