Common Core: 5th Grade Math : Number & Operations with Fractions

Study concepts, example questions & explanations for Common Core: 5th Grade Math

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Example Questions

Example Question #821 : Isee Middle Level (Grades 7 8) Quantitative Reasoning

Zach cleaned \(\displaystyle \frac{1}{8}\) of the house and Alex cleaned \(\displaystyle \frac{1}{3}\) of the house. How much more of the house did Alex clean? 

Possible Answers:

\(\displaystyle \frac{5}{24}\)

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

\(\displaystyle \frac{1}{6}\)

\(\displaystyle \frac{1}{3}\)

\(\displaystyle \frac{7}{24}\)

Correct answer:

\(\displaystyle \frac{5}{24}\)

Explanation:

\(\displaystyle \frac{1}{3}-\frac{1}{8}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{1}{8}\times\frac{3}{3}=\frac{3}{24}\)

\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)

\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)\(\displaystyle \frac{1}{3}\times\frac{8}{8}=\frac{8}{24}\)

Now that we have common denominators, we can subtract the fractions. Remember, when we subtract fractions, the denominator stays the same, we only subtract the numerator. 

\(\displaystyle \frac{8}{24}-\frac{3}{24}=\frac{5}{24}\)

Example Question #31 : How To Subtract Fractions

Lily pulled \(\displaystyle \frac{1}{9}\) of the weeds and Rose pulled \(\displaystyle \frac{1}{3}\). How much more of the weeds did Rose pull? 

 

Possible Answers:

\(\displaystyle \frac{1}{9}\)

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

\(\displaystyle \frac{5}{7}\)

\(\displaystyle \frac{2}9{}\)

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

Correct answer:

\(\displaystyle \frac{2}9{}\)

Explanation:

\(\displaystyle \frac{1}{3}-\frac{1}{9}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{1}{3}\times\frac{3}{3}=\frac{3}{9}\)

Now that we have common denominators, we can subtract the fractions. Remember, when we subtract fractions, the denominator stays the same, we only subtract the numerator. 

\(\displaystyle \frac{3}{9}-\frac{1}{9}=\frac{2}{9}\)

Example Question #823 : Isee Middle Level (Grades 7 8) Quantitative Reasoning

Sally drank \(\displaystyle \frac{1}{12}\) of the milk and Sam drank \(\displaystyle \frac{2}{3}\). How much more of the milk did Sam drink? 

Possible Answers:

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

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

\(\displaystyle \frac{7}{12}\)

\(\displaystyle \frac{7}8{}\)

\(\displaystyle \frac{5}{12}\)

Correct answer:

\(\displaystyle \frac{7}{12}\)

Explanation:

\(\displaystyle \frac{2}{3}-\frac{1}{12}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{2}{3}\times\frac{4}{4}=\frac{8}{12}\)

Now that we have common denominators, we can subtract the fractions. Remember, when we subtract fractions, the denominator stays the same, we only subtract the numerator. 

\(\displaystyle \frac{8}{12}-\frac{1}{12}=\frac{7}{12}\)

 

Example Question #824 : Isee Middle Level (Grades 7 8) Quantitative Reasoning

Jake ate \(\displaystyle \frac{1}{7}\) of the popcorn and Dave ate \(\displaystyle \small \frac{4}{14}\) of the popcorn. How much more of the popcorn did Dave eat? 

Possible Answers:

\(\displaystyle \frac{1}7{}\)

\(\displaystyle \frac{9}{11}\)

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

\(\displaystyle \frac{5}6{}\)

\(\displaystyle \frac{2}7{}\)

Correct answer:

\(\displaystyle \frac{1}7{}\)

Explanation:

\(\displaystyle \frac{4}{14}-\frac{1}{7}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{1}{7}\times\frac{2}{2}=\frac{2}{14}\)

Now that we have common denominators, we can add the fractions. Remember, when we add fractions, the denominator stays the same, we only add the numerator. 

\(\displaystyle \frac{4}{14}-\frac{2}{14}=\frac{2}{14}\)

\(\displaystyle \small \frac{2}{14}\) can be reduced by dividing \(\displaystyle \small 2\) by both sides. 

\(\displaystyle \small \frac {2}{14}\div\frac{2}{2}=\frac{1}{7}\)

Example Question #21 : Number & Operations With Fractions

Sally drank \(\displaystyle \frac{1}{12}\) of the milk and Sam drank \(\displaystyle \frac{2}{3}\). What fraction of the milk did they drink? 

Possible Answers:

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

\(\displaystyle \frac{11}{15}\)

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

\(\displaystyle \frac{3}{15}\)

\(\displaystyle \frac{5}{7}\)

Correct answer:

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

Explanation:

\(\displaystyle \frac{1}{12}+\frac{2}{3}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{2}{3}\times\frac{4}{4}=\frac{8}{12}\)

Now that we have common denominators, we can add the fractions. Remember, when we add fractions, the denominator stays the same, we only add the numerator. 

\(\displaystyle \frac{1}{12}+\frac{8}{12}=\frac{9}{12}\)

\(\displaystyle \frac{9}{12}\) can be reduced by dividing \(\displaystyle 3\) by both sides. 

\(\displaystyle \frac{9}{12}\div \frac{3}{3}=\frac{3}{4}\)

Example Question #287 : Fractions

Lily pulled \(\displaystyle \frac{1}{9}\) of the weeds and Rose pulled \(\displaystyle \frac{1}{3}\). What fraction of the weeds have they pulled? 

Possible Answers:

\(\displaystyle \frac{2}{12}\)

\(\displaystyle \frac{4}{9}\)

\(\displaystyle \frac{1}{6}\)

\(\displaystyle \frac{8}{15}\)

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

Correct answer:

\(\displaystyle \frac{4}{9}\)

Explanation:

\(\displaystyle \frac{1}{9}+\frac{1}{3}\)

In order to solve this problem, we first need to make common denominators. 

\(\displaystyle \frac{1}{3}\times\frac{3}{3}=\frac{3}{9}\)

Now that we have common denominators, we can add the fractions. Remember, when we add fractions, the denominator stays the same, we only add the numerator. 

\(\displaystyle \frac{1}{9}+\frac{3}{9}=\frac{4}{9}\)

Example Question #1 : Solve Word Problems Involving Division Of Whole Numbers Leading To Answers In The Form Of Fractions Or Mixed Numbers: Ccss.Math.Content.5.Nf.B.3

If you bake 374 cookies for your class of 50 people, how many cookies does each student get?

Possible Answers:

Between 6 and 7 cookies

Between 9 and 10 cookies

Between 7 and 8 cookies

Between 10 and 11 cookies

Between 8 and 9 cookies

Correct answer:

Between 7 and 8 cookies

Explanation:

 

 

 

Example Question #2 : Solve Word Problems Involving Division Of Whole Numbers Leading To Answers In The Form Of Fractions Or Mixed Numbers: Ccss.Math.Content.5.Nf.B.3

\(\displaystyle \small 4\) people are sharing a \(\displaystyle \small 23\) pound bag of peanuts. How much will each person get? Select the answer with the pair of numbers that the answer will be between. 

Possible Answers:

\(\displaystyle 5\) and \(\displaystyle \small 6\)

\(\displaystyle \small 3\) and \(\displaystyle \small 4\)

\(\displaystyle \small 6\) and \(\displaystyle \small 7\)

\(\displaystyle \small 2\) and \(\displaystyle \small 3\)

\(\displaystyle \small 4\) and \(\displaystyle \small 5\)

Correct answer:

\(\displaystyle 5\) and \(\displaystyle \small 6\)

Explanation:

We can think of this problem as an improper fraction and solve for the mixed number. 

\(\displaystyle \small \frac{23}{4}=5\frac{3}4{}\)

\(\displaystyle \small 4\) can go into \(\displaystyle \small 23\) only \(\displaystyle \small 5\) times with \(\displaystyle \small \frac{3}{4}\) left over. 

Example Question #22 : Number & Operations With Fractions

\(\displaystyle \small 6\) people are sharing a \(\displaystyle \small \small 37\)  pound bag of peanuts. How much will each person get? Select the answer with the pair of numbers that the answer will be between. 

Possible Answers:

\(\displaystyle \small 7\) and \(\displaystyle \small 8\)

\(\displaystyle \small 8\) and \(\displaystyle \small 9\)

\(\displaystyle \small 5\) and \(\displaystyle \small 6\)

\(\displaystyle \small 4\) and \(\displaystyle \small 5\)

\(\displaystyle \small 6\) and \(\displaystyle \small 7\)

Correct answer:

\(\displaystyle \small 6\) and \(\displaystyle \small 7\)

Explanation:

We can think of this problem as an improper fraction and solve for the mixed number. 

\(\displaystyle \small \frac{37}{6}=6\frac{1}{6}\)

\(\displaystyle \small 6\) can go into \(\displaystyle \small 37\) only \(\displaystyle \small 6\) times with \(\displaystyle \small \frac{1}{6}\) left  over. 

Example Question #23 : Number & Operations With Fractions

\(\displaystyle \small 5\) people are sharing a \(\displaystyle \small 43\) pound bag of peanuts. How much will each person get? Select the answer with the pair of numbers that the answer will be between. 

Possible Answers:

\(\displaystyle \small 10\) and \(\displaystyle \small 11\)

\(\displaystyle \small 12\) and \(\displaystyle \small 13\)

\(\displaystyle \small 11\) and \(\displaystyle \small 12\)

\(\displaystyle \small 8\) and \(\displaystyle \small 9\)

\(\displaystyle \small 9\) and \(\displaystyle 10\)

Correct answer:

\(\displaystyle \small 8\) and \(\displaystyle \small 9\)

Explanation:

We can think of this problem as an improper fraction and solve for the mixed number. 

\(\displaystyle \small \frac{43}{5}=8\frac{3}{5}\)

\(\displaystyle \small 5\) can go into \(\displaystyle \small 43\) only \(\displaystyle \small 8\) times with \(\displaystyle \small \frac{3}{5}\) left over. 

 

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