ISEE Lower Level Quantitative : Operations with fractions and whole numbers

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

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Example Questions

Example Question #11 : Divide Fractions And Whole Numbers: Ccss.Math.Content.5.Nf.B.7

\(\displaystyle \small \frac{5}{6}\div7\)

Possible Answers:

\(\displaystyle \small \frac{7}{38}\)

\(\displaystyle \small \frac{5}{19}\)

\(\displaystyle \small \frac{4}{43}\)

\(\displaystyle \small \frac{3}{17}\)

\(\displaystyle \small \frac{5}{42}\)

Correct answer:

\(\displaystyle \small \frac{5}{42}\)

Explanation:

\(\displaystyle \small \frac{5}{6}\div7\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{5}{6}\times\frac{1}{7}=\frac{5}{42}\)

Example Question #181 : Operations With Fractions And Whole Numbers

\(\displaystyle \small \frac{3}{8}\div5\)

Possible Answers:

\(\displaystyle \small \frac{3}{40}\)

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

\(\displaystyle \small \frac{4}{39}\)

\(\displaystyle \small \frac{2}{17}\)

\(\displaystyle \small \frac{5}{19}\)

Correct answer:

\(\displaystyle \small \frac{3}{40}\)

Explanation:

\(\displaystyle \small \frac{3}{8}\div5\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{3}{8}\times\frac{1}{5}=\frac{3}{40}\)

Example Question #182 : Operations With Fractions And Whole Numbers

\(\displaystyle \small \frac{4}{5}\div3\)

Possible Answers:

\(\displaystyle \small \frac{2}{13}\)

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

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

\(\displaystyle \small \frac{4}{15}\)

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

Correct answer:

\(\displaystyle \small \frac{4}{15}\)

Explanation:

\(\displaystyle \small \frac{4}{5}\div3\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{4}{5}\times\frac{1}{3}=\frac{4}{15}\)

Example Question #183 : Operations With Fractions And Whole Numbers

\(\displaystyle \small \small \frac{1}{6}\div7\)

Possible Answers:

\(\displaystyle \small \frac{5}{37}\)

\(\displaystyle \small \frac{3}{29}\)

\(\displaystyle \small \frac{1}{42}\)

\(\displaystyle \small \frac{2}{42}\)

\(\displaystyle \small \frac{1}{49}\)

Correct answer:

\(\displaystyle \small \frac{1}{42}\)

Explanation:

\(\displaystyle \small \small \frac{1}{6}\div7\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{1}{6}\times\frac{1}{7}=\frac{1}{42}\)

Example Question #184 : Operations With Fractions And Whole Numbers

\(\displaystyle \small \frac{3}{7}\div4\)

Possible Answers:

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

\(\displaystyle \small \frac{4}{27}\)

\(\displaystyle \small \frac{3}{28}\)

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

\(\displaystyle \small \frac{9}{31}\)

Correct answer:

\(\displaystyle \small \frac{3}{28}\)

Explanation:

\(\displaystyle \small \frac{3}{7}\div4\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{3}{7}\times\frac{1}{4}=\frac{3}{28}\)

Example Question #185 : Operations With Fractions And Whole Numbers

\(\displaystyle \small \frac{4}{9}\div5\)

Possible Answers:

\(\displaystyle \small \frac{5}{39}\)

\(\displaystyle \small \frac{4}{45}\)

\(\displaystyle \small \frac{7}{41}\)

\(\displaystyle \small \frac{20}9{}\)

\(\displaystyle \small \frac{9}{20}\)

Correct answer:

\(\displaystyle \small \frac{4}{45}\)

Explanation:

\(\displaystyle \small \frac{4}{9}\div5\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{4}{9}\times\frac{1}{5}=\frac{4}{45}\)

Example Question #411 : Fractions

Solve:

\(\displaystyle \small \frac{3}{4}\div\frac{2}{3}\)

Possible Answers:

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

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

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

\(\displaystyle \small \frac{8}{9}\)

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

Correct answer:

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

Explanation:

\(\displaystyle \small \frac{3}{4}\div\frac{2}{3}\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{3}{4}\times\frac{3}{2}=\frac{9}{8}\)

\(\displaystyle \frac{9}{8}=1\frac{1}{8}\) because \(\displaystyle 8\) can go into \(\displaystyle 9\) one time with \(\displaystyle 1\) left over. 

Example Question #412 : Fractions

Solve:

\(\displaystyle \small \frac{5}{8}\div\frac{1}{2}\)

Possible Answers:

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

\(\displaystyle \small \frac{8}{10}\)

\(\displaystyle \small \frac{5}{11}\)

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

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

Correct answer:

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

Explanation:

\(\displaystyle \small \frac{5}{8}\div\frac{1}{2}\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{5}{8}\times\frac{2}{1}=\frac{10}{8}\)

\(\displaystyle \frac{10}{8}=1\frac{2}{8}=1\frac{1}{4}\) because \(\displaystyle 8\) can go into \(\displaystyle 10\) one time with \(\displaystyle 2\) left over. 

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

Example Question #543 : Number & Operations With Fractions

Solve:

\(\displaystyle \small \frac{3}{12}\div\frac{1}{3}\)

Possible Answers:

\(\displaystyle \small \frac{36}{3}\)

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

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

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

\(\displaystyle \small \frac{3}{36}\)

Correct answer:

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

Explanation:

\(\displaystyle \small \frac{3}{12}\div\frac{1}{3}\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \small \frac{3}{12}\times\frac{3}{1}=\frac{9}{12}\)

\(\displaystyle \frac{9}{12}\) can be reduced because both \(\displaystyle 9\) and \(\displaystyle 12\) are divisible by \(\displaystyle 3\)

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

Example Question #544 : Number & Operations With Fractions

Solve:

\(\displaystyle \small \frac{7}{8}\div\frac{1}{4}\)

Possible Answers:

\(\displaystyle \small \frac{8}{28}\)

\(\displaystyle \small \frac{7}{32}\)

\(\displaystyle \small \frac{32}{7}\)

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

\(\displaystyle \small \frac{9}{15}\)

Correct answer:

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

Explanation:

\(\displaystyle \small \frac{7}{8}\div\frac{1}{4}\)

To divide fractions, we multiply by the reciprocal. In order to find the reciprocal, we simply flip the fraction over. The numerator becomes the denominator and the denominator becomes the numerator. 

\(\displaystyle \small \frac{7}{8}\times\frac{4}{1}=\frac{28}{8}\)

\(\displaystyle \frac{28}{8}=3\frac{4}{8}=3\frac{1}{2}\) because \(\displaystyle 8\) can go into \(\displaystyle 28\) three times, with \(\displaystyle 4\) left over. 

\(\displaystyle \frac{4}{8}\) can be reduced because both \(\displaystyle 4\) and \(\displaystyle 8\) are divisible by \(\displaystyle 4\)

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

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