HSPT Math : Arithmetic

Study concepts, example questions & explanations for HSPT Math

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Example Questions

Example Question #61 : Fractions

Evaluate:

\(\displaystyle 20 - 7.5 \times\left ( 3 - 1.2 \right )\)

Possible Answers:

\(\displaystyle 36.3\)

\(\displaystyle 6.5\)

\(\displaystyle - 3.7\)

\(\displaystyle 22.5\)

\(\displaystyle -1.3\)

Correct answer:

\(\displaystyle 6.5\)

Explanation:

By the order of operations, carry out the operation in parentheses, which is the rightmost subtraction, then the multiplication, then the leftmost subtraction:

\(\displaystyle 20 - 7.5 \times\left ( 3 - 1.2 \right )\)

\(\displaystyle = 20 - 7.5 \times 1.8\)

\(\displaystyle = 20 - 13.5\)

\(\displaystyle = 6.5\)

Example Question #56 : Identities And Properties

Which of the following statements demonstrates the identity property of multiplication?

Possible Answers:

None of the examples in the other responses demonstrates the identity property of multiplication.

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

\(\displaystyle \left (\frac{2}{3} \times \frac{5}{7} \right ) \times \frac{6}{11} = \frac{2}{3} \times\left ( \frac{5}{7} \times \frac{6}{11} \right )\)

\(\displaystyle \frac{2}{3} \times \frac{5}{7} = \frac{5}{7} \times \frac{2}{3}\)

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

Correct answer:

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

Explanation:

The identity property of multiplication states that there is a number 1, called the multiplicative identity, that can be multiplied by any number to obtain that number. Of the four statements, 

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

demonstrates this property.

Example Question #1 : Fractions

\(\displaystyle Z\) is larger than 0.  Which of the following could be equal to \(\displaystyle 3 \times Z\)?

 

I.  \(\displaystyle 6\)

II. \(\displaystyle 2\frac{2}{7}\)

 

III. \(\displaystyle 8\)

Possible Answers:

I and II

I only

II only

III only

I, II and III

Correct answer:

I, II and III

Explanation:

All of the answers can be divided by 3 to yield an answer larger than zero.  In fact, any positive number would be a viable answer.

Example Question #1 : How To Divide Fractions

Express the quotient as a fraction in lowest terms: 

\(\displaystyle 5 \frac{3}{5} \div 4 \frac{1}{5}\)

Possible Answers:

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

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

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

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

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

Correct answer:

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

Explanation:

Rewrite the mixed fractions as improper fractions, change to a multiplication by inverting the second, cross-cancel, and multiply across:

 \(\displaystyle 5 \frac{3}{5} \div 4 \frac{1}{5} = \frac{28}{5 } \div \frac{21}{5 } = \frac{28}{5 } \cdot \frac{5}{21 }= \frac{4}{1 } \cdot \frac{1}{3 }= \frac{4}{3 }\) 

Example Question #351 : Arithmetic

Express the quotient as a fraction in lowest terms: 

\(\displaystyle 4 \frac{1}{5} \div 5 \frac{3}{5}\)

Possible Answers:

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

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

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

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

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

Correct answer:

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

Explanation:

Rewrite the mixed fractions as improper fractions, change to a multiplication by inverting the second, cross-cancel, and multiply across:

\(\displaystyle 4 \frac{1}{5} \div 5 \frac{3}{5} = \frac{21}{5} \div \frac{28}{5} = \frac{21}{5} \cdot \frac{5}{28} = \frac{3}{1} \cdot \frac{1}{4} = \frac{3}{4}\)

Example Question #352 : Arithmetic

Evaluate:

\(\displaystyle \frac{12}{5} \div \frac{4}{25}\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle \frac{8}{25}\)

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

\(\displaystyle \frac{1}{15}\)

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

Correct answer:

\(\displaystyle 15\)

Explanation:

Multiply by the reciprocal, cross-cancel, then multiply numerators and denominators:

\(\displaystyle \frac{12}{5} \div \frac{4}{25} = \frac{12}{5} \times \frac{25}{4} = \frac{3}{1} \times \frac{5}{1} = \frac{15}{1} = 15\)

Example Question #353 : Arithmetic

Evaluate:

\(\displaystyle \frac{4}{25} \div \frac{12}{5}\)

Possible Answers:

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

\(\displaystyle \frac{1}{15}\)

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

\(\displaystyle 15\)

\(\displaystyle \frac{8}{25}\)

Correct answer:

\(\displaystyle \frac{1}{15}\)

Explanation:

Multiply by the reciprocal, cross-cancel, then multiply numerators and denominators:

\(\displaystyle \frac{4}{25} \div \frac{12}{5} = \frac{4}{25} \times \frac{5}{12} = \frac{1}{5} \times \frac{1}{3} = \frac{1}{15}\)

Example Question #354 : Arithmetic

Evaluate:

\(\displaystyle \frac{5}{8} \div \frac{25}{16}\)

Possible Answers:

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

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

\(\displaystyle \frac{1}{10}\)

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

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

Correct answer:

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

Explanation:

Multiply by the reciprocal, cross-cancel, then multiply numerators and denominators:

\(\displaystyle \frac{5}{8} \div \frac{25}{16} = \frac{5}{8} \times \frac{16}{25} = \frac{1}{1} \times \frac{2}{5} = \frac{2}{5}\)

Example Question #4 : Fractions

Evaluate:

\(\displaystyle \frac{8}{5} \div \frac{24}{35}\)

Possible Answers:

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

\(\displaystyle \frac{1}{21}\)

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

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

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

Correct answer:

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

Explanation:

Multiply by the reciprocal, cross-cancel, then multiply numerators and denominators:

\(\displaystyle \frac{8}{5} \div \frac{24}{35} = \frac{8}{5} \times \frac{35}{24} = \frac{1}{1} \times \frac{7}{3} =\frac{7}{3}\)

Example Question #355 : Arithmetic

Evaluate:

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

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 36\)

\(\displaystyle \frac{1}{36}\)

\(\displaystyle 48\)

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

Correct answer:

\(\displaystyle 36\)

Explanation:

\(\displaystyle 3 \div \frac{1}{12} = \frac{3}{1} \div \frac{1}{12} = \frac{3}{1}\times \frac{12}{1} = 3 \times 12 = 36\)

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