Common Core: 6th Grade Math : Use Ratio Reasoning to Convert Measurement Units: CCSS.Math.Content.6.RP.A.3d

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

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Example Questions

Example Question #1 : Use Ratio Reasoning To Convert Measurement Units: Ccss.Math.Content.6.Rp.A.3d

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 98\ inches\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 8 \tfrac{5}{6} \ feet\)

\(\displaystyle 9 \tfrac{1}{6} \ feet\)

\(\displaystyle 7 \tfrac{5}{6} \ feet\)

\(\displaystyle 9 \tfrac{5}{6} \ feet\)

\(\displaystyle 8 \tfrac{1}{6} \ feet\)

Correct answer:

\(\displaystyle 8 \tfrac{1}{6} \ feet\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 98\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 98\ inches:x\ feet\rightarrow \frac{98\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{98\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=98\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=98\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{98}{12}\)

Solve.

\(\displaystyle x=8 \tfrac{2}{12} \ feet\)

Reduce.

\(\displaystyle x=8 \tfrac{1}{6} \ feet\)

The carpenter needs \(\displaystyle 8 \tfrac{1}{6} \ feet\) of material.

Example Question #2 : Conversions

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 124\ inches\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 11 \tfrac{1}{3} \ feet\)

\(\displaystyle 10 \tfrac{1}{3} \ feet\)

\(\displaystyle 9 \tfrac{2}{3} \ feet\)

\(\displaystyle 10 \tfrac{2}{3} \ feet\)

\(\displaystyle 10 \tfrac{3}{5} \ feet\)

Correct answer:

\(\displaystyle 10 \tfrac{1}{3} \ feet\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 124\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 124\ inches:x\ feet\rightarrow \frac{124\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{124\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=124\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=124\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{124}{12}\)

Solve.

\(\displaystyle x=10 \tfrac{4}{12} \ feet\)

Reduce.

\(\displaystyle x=10 \tfrac{1}{3} \ feet\)

The carpenter needs \(\displaystyle 10 \tfrac{1}{3} \ feet\) of material.

Example Question #93 : Numbers And Operations

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 39\ inches\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 3 \tfrac{2}{5} \ feet\)

\(\displaystyle 3 \tfrac{1}{2} \ feet\)

\(\displaystyle 3 \tfrac{1}{4} \ feet\)

\(\displaystyle 3 \tfrac{1}{5} \ feet\)

\(\displaystyle 3 \tfrac{3}{4} \ feet\)

Correct answer:

\(\displaystyle 3 \tfrac{1}{4} \ feet\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 39\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 39\ inches:x\ feet\rightarrow \frac{39\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{39\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=39\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=39\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{39}{12}\)

Solve.

\(\displaystyle x=3 \tfrac{3}{12} \ feet\)

Reduce.

\(\displaystyle x=3 \tfrac{1}{4} \ feet\)

The carpenter needs \(\displaystyle 3 \tfrac{1}{4} \ feet\) of material.

Example Question #1 : Solving Word Problems With One Unit Conversion

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 87\ inches\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 8 \tfrac{1}{5} \ feet\)

\(\displaystyle 8 \tfrac{1}{4} \ feet\)

\(\displaystyle 7 \tfrac{1}{4} \ feet\)

\(\displaystyle 6 \tfrac{3}{4} \ feet\)

\(\displaystyle 7 \tfrac{2}{5} \ feet\)

Correct answer:

\(\displaystyle 7 \tfrac{1}{4} \ feet\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 87\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 87\ inches:x\ feet\rightarrow \frac{87\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{87\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=87\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=87\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{87}{12}\)

Solve.

\(\displaystyle x=7 \tfrac{3}{12} \ feet\)

Reduce.

\(\displaystyle x=7 \tfrac{1}{4} \ feet\)

The carpenter needs \(\displaystyle 7 \tfrac{1}{4} \ feet\) of material.

Example Question #1 : Solving Word Problems With One Unit Conversion

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 144\ inches\) of the moulding for the house. How many additional feet of the material will he need to purchase to finish the model?

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 8\)

\(\displaystyle 10\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 4\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 144\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 144\ inches:x\ feet\rightarrow \frac{144\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{144\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=144\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=144\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{144}{12}\)

Solve.

\(\displaystyle x=12 \ feet\)

The carpenter needs \(\displaystyle 12 \ feet\) of material. Since he already has \(\displaystyle 8 feet\) he will need to purchase \(\displaystyle 4\) more to finish the project.

Example Question #91 : Ratio And Proportion

A carpenter is making a model house and he buys \(\displaystyle 8\ feet\) of crown moulding to use as accent pieces. He needs \(\displaystyle 164\ inches\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 13 \tfrac{1}{5} \ feet\)

\(\displaystyle 13 \tfrac{1}{3} \ feet\)

\(\displaystyle 11 \tfrac{2}{3} \ feet\)

\(\displaystyle 13 \tfrac{2}{3} \ feet\)

\(\displaystyle 12 \tfrac{1}{3} \ feet\)

Correct answer:

\(\displaystyle 13 \tfrac{2}{3} \ feet\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 164\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 164\ inches:x\ feet\rightarrow \frac{164\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{164\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=164\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=164\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{164}{12}\)

Solve.

\(\displaystyle x=13 \tfrac{8}{12} \ feet\)

Reduce.

\(\displaystyle x=13 \tfrac{2}{3} \ feet\)

The carpenter needs \(\displaystyle 13 \tfrac{2}{3} \ feet\) of material.

Example Question #3 : Use Ratio Reasoning To Convert Measurement Units: Ccss.Math.Content.6.Rp.A.3d

A carpenter is making a model house and he buys \(\displaystyle 8\textup{ feet}\) of crown molding to use as accent pieces. He needs \(\displaystyle 18\textup{ inches}\) of the molding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 1 \tfrac{2}{3} \textup{ feet}\)

\(\displaystyle 2 \tfrac{1}{2} \textup{ feet}\)

\(\displaystyle 3 \tfrac{1}{2} \textup{ feet}\)

\(\displaystyle 1 \tfrac{1}{2} \textup{ feet}\)

\(\displaystyle 2 \tfrac{3}{4} \textup{ feet}\)

Correct answer:

\(\displaystyle 1 \tfrac{1}{2} \textup{ feet}\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 18\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 18\ inches:x\ feet\rightarrow \frac{18\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{18\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=18\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=18\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{18}{12}\)

Solve.

\(\displaystyle x=1 \tfrac{1}{2} \ feet\)

The carpenter needs \(\displaystyle 1 \tfrac{1}{2} \ feet\) of material.

Example Question #4 : Use Ratio Reasoning To Convert Measurement Units: Ccss.Math.Content.6.Rp.A.3d

A carpenter is making a model house and he buys \(\displaystyle 8\textup{ feet}\) of crown moulding to use as accent pieces. He needs \(\displaystyle 9\textup{ inches}\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle \frac {2}{3} \textup{ feet}\)

\(\displaystyle \frac {1}{2} \textup{ feet}\)

\(\displaystyle \frac {1}{4} \textup{ feet}\)

\(\displaystyle \frac {3}{5} \textup{ feet}\)

\(\displaystyle \frac {3}{4} \textup{ feet}\)

Correct answer:

\(\displaystyle \frac {3}{4} \textup{ feet}\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 9 \ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 9\ inches:x\ feet\rightarrow \frac{9\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{9\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=9\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=9\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{9}{12}\)

Solve.

\(\displaystyle x=\frac{9}{12} \ feet\)

Reduce.

\(\displaystyle x=\frac{3}{4} \ feet\)

The carpenter needs \(\displaystyle \frac {3}{4} \ feet\) of material.

Example Question #2 : Solving Word Problems With One Unit Conversion

A carpenter is making a model house and he buys \(\displaystyle 8\textup{ feet}\) of crown moulding to use as accent pieces. He needs \(\displaystyle 24\textup{ inches}\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 1 \tfrac{1}{2}\textup{ feet}\)

\(\displaystyle 2 \tfrac{2}{3}\textup{ feet}\)

\(\displaystyle 2 \textup{ feet}\)

\(\displaystyle 2 \tfrac{3}{4}\textup{ feet}\)

\(\displaystyle 2 \tfrac{1}{2}\textup{ feet}\)

Correct answer:

\(\displaystyle 2 \textup{ feet}\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 24\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 24\ inches:x\ feet\rightarrow \frac{24\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{24\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=24\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=24\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{24}{12}\)

Solve.

\(\displaystyle x=2 \ feet\)

The carpenter needs \(\displaystyle 2 \ feet\) of material.

Example Question #4 : Use Ratio Reasoning To Convert Measurement Units: Ccss.Math.Content.6.Rp.A.3d

A carpenter is making a model house and he buys \(\displaystyle 8\textup{ feet}\) of crown moulding to use as accent pieces. He needs \(\displaystyle 38\textup{ inches}\) of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

\(\displaystyle 3 \tfrac{3}{4}\textup{ feet}\)

\(\displaystyle 3 \tfrac{1}{6}\textup{ feet}\)

\(\displaystyle 2 \tfrac{5}{6}\textup{ feet}\)

\(\displaystyle 3 \tfrac{5}{6}\textup{ feet}\)

\(\displaystyle 3 \tfrac{1}{2} \textup{ feet}\)

Correct answer:

\(\displaystyle 3 \tfrac{1}{6}\textup{ feet}\)

Explanation:

We can solve this problem using ratios. There are \(\displaystyle 12\ inches\) in \(\displaystyle 1\ foot\). We can write this relationship as the following ratio:

\(\displaystyle 12\ inches:1\ foot\rightarrow \frac{12\ inches}{1\ foot}\)

We know that the carpenter needs \(\displaystyle 38\ inches\) of material to finish the house. We can write this as a ratio using the variable \(\displaystyle x\) to substitute the amount of feet.

\(\displaystyle 38\ inches:x\ feet\rightarrow \frac{38\ inches}{x\ feet}\)

Now, we can solve for \(\displaystyle x\) by creating a proportion using our two ratios.

\(\displaystyle \frac{12\ inches}{1\ foot}=\frac{38\ inches}{x\ feet}\)

Cross multiply and solve for \(\displaystyle x\).

\(\displaystyle 12\ inches \times (x\ feet)=38\ inches \times (1\ foot)\)

Simplify.

\(\displaystyle 12x=38\)

Divide both sides by \(\displaystyle 12\).

\(\displaystyle \frac{12x}{12}=\frac{38}{12}\)

Solve.

\(\displaystyle x=3 \tfrac{2}{12} \ feet\)

Reduce.

\(\displaystyle x=3 \tfrac{1}{6} \ feet\)

The carpenter needs \(\displaystyle 3 \tfrac{1}{6} \ feet\) of material.

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