ISEE Middle Level Quantitative : How to add fractions

Study concepts, example questions & explanations for ISEE Middle Level Quantitative

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Example Questions

Example Question #2024 : Numbers And Operations

Solve:

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

Possible Answers:

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

\(\displaystyle \frac{6}{7}\)

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

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

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

Correct answer:

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

Explanation:

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

In order to solve this problem, we first have to find common denominators. 

\(\displaystyle \frac{2}{3}\times\frac{2}{2}=\frac{4}{6}\)

\(\displaystyle \frac{1}{2}\times\frac{}3{3}=\frac{3}{6}\)

Now that we have common denominators, we can add the fractions. Remember, when we add and subtract fractions, we only add or subtract the numerator. 

\(\displaystyle \frac{4}{6}+\frac{3}{6}=\frac{7}{6}\)

\(\displaystyle \frac{7}{6}=1\frac{1}{6}\) because \(\displaystyle 6\) can go into \(\displaystyle 7\) one time with \(\displaystyle \frac{1}{6}\) left over. 

Example Question #62 : How To Add Fractions

Solve: 

\(\displaystyle \frac{1}{4}+\frac{4}{8}\)

Possible Answers:

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

\(\displaystyle \frac{8}{6}\)

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

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

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

Correct answer:

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

Explanation:

\(\displaystyle \frac{1}{4}+\frac{4}{8}\)

In order to solve this problem, we first have to find common denominators. 

\(\displaystyle \frac{1}{4}\times\frac{2}{2}=\frac{2}{8}\)

Now that we have common denominators, we can add the fractions. Remember, when we add and subtract fractions, we only add or subtract the numerator. 

\(\displaystyle \frac{2}{8}+\frac{4}{8}=\frac{6}{8}\)

\(\displaystyle \frac{6}{8}\div\frac{2}{2}=\frac{3}{4}\)

Example Question #63 : How To Add Fractions

Solve:

\(\displaystyle \frac{4}6{+\frac{3}{8}}\)

Possible Answers:

\(\displaystyle \frac{25}{48}\)

\(\displaystyle \frac{24}{25}\)

\(\displaystyle \frac{7}{14}\)

\(\displaystyle 1\frac{1}{24}\)

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

Correct answer:

\(\displaystyle 1\frac{1}{24}\)

Explanation:

\(\displaystyle \frac{4}6{+\frac{3}{8}}\)

In order to solve this problem, we first have to find common denominators. 

\(\displaystyle \frac{4}{6}\times\frac{4}{4}=\frac{16}{24}\)

\(\displaystyle \frac{3}{8}\times\frac{3}{3}=\frac{9}{24}\)

Now that we have common denominators, we can add the fractions. Remember, when we add and subtract fractions, we only add or subtract the numerator. 

\(\displaystyle \frac{16}{24}+\frac{9}{24}=\frac{25}{24}\)

\(\displaystyle \frac{25}{24}=1\frac{1}{24}\) because \(\displaystyle 24\) can go into \(\displaystyle 25\) one time with \(\displaystyle 1\) left over. 

Example Question #1581 : How To Add

Solve:

\(\displaystyle \frac{7}8{+\frac{2}{4}}\)

Possible Answers:

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

\(\displaystyle \frac{16}{11}\)

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

\(\displaystyle \frac{8}{11}\)

\(\displaystyle \frac{11}{16}\)

Correct answer:

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

Explanation:

\(\displaystyle \frac{7}8{+\frac{2}{4}}\)

In order to solve this problem, we first have to find common denominators. \(\displaystyle \frac{2}{4}\times\frac{2}{2}=\frac{4}{8}\)

Now that we have common denominators, we can add the fractions. Remember, when we add and subtract fractions, we only add or subtract the numerator. 

\(\displaystyle \frac{7}{8}+\frac{4}{8}=\frac{11}{8}\)

\(\displaystyle \frac{11}{8}=1\frac{3}{8}\) because \(\displaystyle 8\) can go into \(\displaystyle 11\) one time with \(\displaystyle 3\) left over. 

Example Question #1582 : How To Add

Solve:

\(\displaystyle \frac{3}{5}+\frac{1}3\)

Possible Answers:

\(\displaystyle \frac{14}{30}\)

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

\(\displaystyle \frac{13}{15}\)

\(\displaystyle \frac{14}{15}\)

\(\displaystyle \frac{4}{8}\)

Correct answer:

\(\displaystyle \frac{14}{15}\)

Explanation:

\(\displaystyle \frac{3}{5}+\frac{1}3\)

In order to solve this problem, we first have to find common denominators. 

\(\displaystyle \frac{3}5{} \times\frac{3}{3}=\frac{9}{15}\)

\(\displaystyle \frac{1}{3}\times\frac{5}{5}=\frac{5}{15}\)

Now that we have common denominators, we can add the fractions. Remember, when we add and subtract fractions, we only add or subtract the numerator. 

\(\displaystyle \frac{9}{15}+\frac{5}{15}=\frac{14}{15}\)

Example Question #61 : How To Add Fractions

Joe paited \(\displaystyle \frac{3}{10}\) of the fence an Sara painted \(\displaystyle \frac{1}{2}\). How much of the fence is painted?

Possible Answers:

\(\displaystyle \frac{9}{10}\)

\(\displaystyle \frac{4}{12}\)

\(\displaystyle \frac{7}{10}\)

\(\displaystyle \frac{4}{5}\)

\(\displaystyle \frac{3}{7}\)

Correct answer:

\(\displaystyle \frac{4}{5}\)

Explanation:

\(\displaystyle \frac{3}{10}+\frac{1}{2}\)

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

\(\displaystyle \frac{1}{2}\times\frac{5}{5}=\frac{5}{10}\)

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. 

 \(\displaystyle \frac{3}{10 }+\frac{5}{10}=\frac{8}{10}\)

\(\displaystyle \frac{8}{10}\) can be reduced be dividing both sides by \(\displaystyle 2\).

\(\displaystyle \frac{8}{10} \div\frac{2}{2}=\frac{4}{5}\)

Example Question #2 : Solve Word Problems Involving Addition And Subtraction Of Fractions: Ccss.Math.Content.5.Nf.A.2

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

Possible Answers:

\(\displaystyle \frac{2}{11}\)

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

\(\displaystyle \frac{12}{21}\)

\(\displaystyle \frac{11}{24}\)

\(\displaystyle \frac{5}{9}\)

Correct answer:

\(\displaystyle \frac{11}{24}\)

Explanation:

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

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

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

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

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. 

\(\displaystyle \frac{3}{24}+\frac{8}{24}=\frac{11}{24}\)

Example Question #62 : How To Add Fractions

Ben washed \(\displaystyle \frac{3}{8}\) of the windows and Jen washed \(\displaystyle \frac{1}{4}\). How much of the windows have they washed? 

Possible Answers:

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

\(\displaystyle \frac{4}{12}\)

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

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

\(\displaystyle \frac{5}{8}\)

Correct answer:

\(\displaystyle \frac{5}{8}\)

Explanation:

\(\displaystyle \frac{3}{8}+\frac{1}{4}\)

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

\(\displaystyle \frac{1}{4}\times\frac{2}{2}=\frac{2}{8}\)

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. 

\(\displaystyle \frac{3}{8}+\frac{2}8{=\frac{5}{8}}\)

Example Question #4 : Number & Operations With Fractions

Jake ate \(\displaystyle \frac{1}{7}\) of the popcorn and Dave ate \(\displaystyle \small \frac{4}{14}\) of the popcorn. How much of the popcorn have they eaten? 

Possible Answers:

\(\displaystyle \small \frac{5}{21}\)

\(\displaystyle \small \frac{13}{21}\)

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

\(\displaystyle \small \frac{3}{7}\)

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

Correct answer:

\(\displaystyle \small \frac{3}{7}\)

Explanation:

\(\displaystyle \small \frac{1}{7}+\frac{4}{14}\)

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. 

\(\displaystyle \small \frac{2}{14}+\frac{4}{14}=\frac{6}{14}\)

\(\displaystyle \small \frac{6}{14}\) can be reduced by dividing \(\displaystyle \small 2\) by both sides. 

\(\displaystyle \small \frac{6}{14}\div\frac{2}{2}=\frac{3}{7}\)

Example Question #3 : Solve Word Problems Involving Addition And Subtraction Of Fractions: Ccss.Math.Content.5.Nf.A.2

Jessica ate \(\displaystyle \frac{1}{3}\) of the cake and Megan ate \(\displaystyle \frac{1}{2}\). How much of the cake have they eaten? 

Possible Answers:

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

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

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

\(\displaystyle \frac{5}{8}\)

\(\displaystyle \frac{2}{5}\)

Correct answer:

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

Explanation:

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

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

\(\displaystyle \frac{1}3{\times\frac{2}{2}=\frac{2}{6}}\)

\(\displaystyle \frac{1}{2}\times\frac{3}{3}=\frac{3}{6}\)

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. 

\(\displaystyle \frac{2}{6}+\frac{3}{6}=\frac{5}{6}\)

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