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ISEE Middle Level Math : Numbers and Operations

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All ISEE Middle Level Math Resources

6 Diagnostic Tests 303 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #321 : Concepts

Which of the following is the reciprocal of $-1 \frac {4}{5}$ ?

Possible Answers:

$-\frac {5}{9}$

$-5 \frac {1}{4}$

$1 \frac {4}{5}$

$\frac {5}{9}$

Correct answer:

$-\frac {5}{9}$

Explanation:

First, rewrite this as an improper fraction:

$-1 \frac {4}{5} =-\frac {5 \times 1+ 4}{5}= -\frac {9}{5}$

The reciprocal of an improper fraction can be found by switching its numerator and denominator, retaining the negative sign, so the reciprocal is $-\frac {5}{9}$ .

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Example Question #322 : Concepts

Which of the following is the reciprocal of 2.8?

Possible Answers:

$\frac{5}{14}$

$2 \frac{4}{5}$

$-2 \frac{4}{5}$

$\frac{2}{7}$

Correct answer:

$\frac{5}{14}$

Explanation:

First, rewrite this as an improper fraction:

$2.8 = \frac{28}{10} = \frac{28\div 2}{10\div 2} = \frac{14}{5}$

The reciprocal of an improper fraction can be found by switching its numerator and denominator, so the reciprocal is $\frac{5}{14}$ .

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Example Question #323 : Concepts

Solve:

$\frac{3}{7}\div \frac{1}{5}$

Possible Answers:

$\frac{3}{35}$

$\frac{3}{2}$

$\frac{15}{7}$

$\frac{1}{2}$

Correct answer:

$\frac{15}{7}$

Explanation:

$\frac{3}{7}\div \frac{1}{5}=\frac{3}{7}\times \frac{5}{1}=\frac{15}{7}$

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Example Question #324 : Concepts

Which of the following is the reciprocal of 31.25?

Possible Answers:

0.024

0.032

0.036

0.028

Correct answer:

0.032

Explanation:

Rewrite 31.25 as a fraction:

$31.25 = \frac{3,125}{100} = \frac{3,125\div 25}{100\div 25} = \frac{125}{4}$

Exchange the positions of the numerator and the denominator to get $\frac{4}{125}$ . Now divide 4 by 125:

$\frac{4}{125} = 4 \div 125 = 0.032$

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Example Question #325 : Concepts

Solve:

$\frac{9}{10}\div \frac{3}{5}=$

Possible Answers:

$\frac{5}{6}$

$\frac{2}{3}$

$\frac{3}{2}$

$\small \frac{6}{5}$

Correct answer:

$\frac{3}{2}$

Explanation:

$\small \frac{9}{10}\div \frac{3}{5}=\frac{9}{10}\times\frac{5}{3}=\frac{45}{30}=\frac{3}{2}$

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Example Question #326 : Concepts

$\frac{7}{49}\div \frac{2}{14}=$

Possible Answers:

$\frac{2}{94}$

$1\frac{3}{4}$

196

Correct answer:

Explanation:

Change division to multiplication by flipping the second fraction. Then, simplify and perform the multiplication.

$\frac{7}{49}\div \frac{2}{14}=$

$\frac{7}{49}\times \frac{14}{2}= \frac{1}{7}\times \frac{7}{1}=\frac{7}{7}=1$

The answer is 1.

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Example Question #327 : Concepts

$12 \frac{4}{6} \div 4\frac{2}{4}=$

Possible Answers:

$2\frac{20}{27}$

$2\frac{7}{9}$

$3\frac{1}{3}$

$2\frac{22}{27}$

$1\frac{2}{3}$

Correct answer:

$2\frac{22}{27}$

Explanation:

First convert each fraction into an improper fraction.

$\frac{76}{6}\div \frac{18}{4}=$

Then flip the second fraction, reduce and multiply:

$\frac{76}{6}\ast \frac{4}{18}=$

The answer is $2\frac{22}{27}$ .

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Example Question #328 : Concepts

Divide:

$\frac{4}{9}\div \frac{2}{3}$

Possible Answers:

$\frac{7}{}9$

$\frac{2}{3}$

$\frac{1}{}3$

$\frac{4}{}9$

$\frac{3}{4}$

Correct answer:

$\frac{2}{3}$

Explanation:

The first step in dividing fractions is to make the second fraction a reciprocal (flip it) and then rewrite the problem as a multiplication problem: $\left(\frac{4}{9}\times \frac{3}{2}\right)$ .

You can cross-reduce so that the problem now becomes $\left(\frac{2}{3}\times \frac{1}{1}\right)$ . Then, mulitply straight across so that your answer is $\frac{2}{3}$ .

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Example Question #1421 : Isee Middle Level (Grades 7 8) Mathematics Achievement

What is the below expression equal to?

$\frac{3}{5}\div \frac{2}{7}$

Possible Answers:

$\frac{1}{2}$

$\frac{10}{21}$

$\frac{21}{10}$

Correct answer:

$\frac{21}{10}$

Explanation:

When one fraction is being divided by another, the latter fraction must be inverted. The numerators are then multiplied by each other, and the denominators are also multiplied by each other.

$\frac{3}{5}\div \frac{2}{7}$

$\frac{3}{5}\cdot \frac{7}{2}=\frac{21}{10}$

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Example Question #329 : Concepts

What is the value of in this equation?

$\frac{9}{5}\div \frac{5}{7}=x$

Possible Answers:

$\frac{9}{7}$

$\frac{25}{63}$

$\frac{63}{25}$

$\frac{7}{9}$

Correct answer:

$\frac{63}{25}$

Explanation:

In order to solve $\frac{9}{5}\div \frac{5}{7}$ , the latter fraction must be inverted and then multiplied by the first fraction, as shown below:

$\frac{9}{5}\cdot \frac{7}{5} = \frac{63}{25}$

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All ISEE Middle Level Math Resources

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ISEE Middle Level Math : Numbers and Operations

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

All ISEE Middle Level Math Resources

Example Questions

Example Question #321 : Concepts

Example Question #322 : Concepts

Example Question #323 : Concepts

Example Question #324 : Concepts

Example Question #325 : Concepts

Example Question #326 : Concepts

Example Question #327 : Concepts

Example Question #328 : Concepts

Example Question #1421 : Isee Middle Level (Grades 7 8) Mathematics Achievement

Example Question #329 : Concepts

All ISEE Middle Level Math Resources

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