SSAT Upper Level Math : SSAT Upper Level Quantitative (Math)

Study concepts, example questions & explanations for SSAT Upper Level Math

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Example Questions

Example Question #241 : Rational Numbers

Define an operation \(\displaystyle \blacklozenge\) as follows:

For all real numbers \(\displaystyle a,b\):

 \(\displaystyle a\blacklozenge b = a^{2} - b^{2}\)

Which of the following is closest to \(\displaystyle \frac{1}{2} \blacklozenge \frac{1}{3}\) ?

Possible Answers:

\(\displaystyle 0.3\)

\(\displaystyle 0.2\)

\(\displaystyle 0.1\)

\(\displaystyle 0.15\)

\(\displaystyle 0.25\)

Correct answer:

\(\displaystyle 0.15\)

Explanation:

\(\displaystyle a\blacklozenge b = a^{2} - b^{2}\)

\(\displaystyle \frac{1}{2} \blacklozenge \frac{1}{3} =\left ( \frac{1}{2} \right ) ^{2} - \left ( \frac{1}{3} \right )^{2}= \frac{1}{4} - \frac{1}{9}= \frac{9}{36} - \frac{4}{36}= \frac{5}{36}\)

\(\displaystyle = 5 \div 36 = 0.13888...\)

The correct choice is 0.15.

Example Question #1371 : Ssat Upper Level Quantitative (Math)

Let \(\displaystyle a =1 \frac{4}{9}\)\(\displaystyle b = 1\frac{3}{8}\), and \(\displaystyle c= \frac{1}{2}\).

Which of the following is closest to \(\displaystyle a bc\) ?

Possible Answers:

\(\displaystyle 1\)

\(\displaystyle 1.3\)

\(\displaystyle 1.4\)

\(\displaystyle 1.2\)

\(\displaystyle 1.1\)

Correct answer:

\(\displaystyle 1\)

Explanation:

\(\displaystyle a bc=1 \frac{4}{9} \times 1\frac{3}{8} \times \frac{1}{2}= \frac{13}{9} \times \frac{11}{8} \times \frac{1}{2}= \frac{143}{144}= 143 \div 144 \approx 0.99\)

The correct response is 1.

Example Question #4 : Decimals With Fractions

Simplify and express as a decimal:

\(\displaystyle \frac{4\frac{2}{3}}{5\frac{3}{5}}\)

Possible Answers:

\(\displaystyle 0.\overline{8}\)

\(\displaystyle 0.8\)

\(\displaystyle 0.8\overline{3}\)

\(\displaystyle 0.875\)

\(\displaystyle 0.9\)

Correct answer:

\(\displaystyle 0.8\overline{3}\)

Explanation:

\(\displaystyle \frac{4\frac{2}{3}}{5\frac{3}{5}} = 4\frac{2}{3} \div 5\frac{3}{5} = \frac{14}{3} \div \frac{28}{5} = \frac{14}{3} \times \frac{5} {28} = \frac{1}{3} \times \frac{5} {2} = \frac{5}{6}\)

\(\displaystyle \frac{5}{6}= 5 \div 6 = 0.8333...\)

so the correct response is \(\displaystyle 0.8\overline{3}\).

Example Question #11 : Decimals With Fractions

Define an operation \(\displaystyle \blacklozenge\) as follows:

For all real numbers \(\displaystyle a,b\):

 \(\displaystyle a\blacklozenge b = \frac{ab}{a+b}\)

Which of the following is equal to \(\displaystyle \frac{1}{2} \blacklozenge \frac{1}{3}\) ?

Possible Answers:

\(\displaystyle 0.25\)

The correct answer is not among the other choices.

\(\displaystyle 0.\overline{2}\)

\(\displaystyle 0.2\)

\(\displaystyle 0.1\overline{6}\)

Correct answer:

\(\displaystyle 0.2\)

Explanation:

\(\displaystyle a\blacklozenge b = \frac{ab}{a+b}\)

\(\displaystyle \frac{1}{2} \blacklozenge \frac{1}{3}=\frac{\frac{1}{2} \times \frac{1}{3}}{\frac{1}{2} +\frac{1}{3}}=\frac{\frac{1}{6} }{\frac{5}{6} } = \frac{1}{6} \div \frac{5}{6} = \frac{1}{6} \times \frac{6} {5} = \frac{1}{1} \times \frac{1} {5} = \frac{1}{5}\)

\(\displaystyle \frac{1}{5} = 1 \div 5 = 0.2\),

is the correct response.

Example Question #1371 : Ssat Upper Level Quantitative (Math)

Which of the following is a true statement?

Possible Answers:

\(\displaystyle 0.54 < \frac{7}{13} < 0.55\)

\(\displaystyle 0.55 < \frac{7}{13} < 0.56\)

\(\displaystyle 0.52 < \frac{7}{13} < 0.53\)

\(\displaystyle 0.56 < \frac{7}{13} < 0.57\)

\(\displaystyle 0.53 < \frac{7}{13} < 0.54\)

Correct answer:

\(\displaystyle 0.53 < \frac{7}{13} < 0.54\)

Explanation:

Divide 7 by 13. The result is as follows:

Division

The correct choice is that \(\displaystyle 0.53 < \frac{7}{13} < 0.54\).

Example Question #1372 : Ssat Upper Level Quantitative (Math)

Which of the following is closest to the sum of two thirds and four fifths?

Possible Answers:

\(\displaystyle 1.6\)

\(\displaystyle 1.55\)

\(\displaystyle 1.45\)

\(\displaystyle 1.4\)

\(\displaystyle 1.5\)

Correct answer:

\(\displaystyle 1.45\)

Explanation:

\(\displaystyle \frac{2}{3} + \frac{4}{5} = \frac{2 \cdot 5}{3\cdot 5} + \frac{3\cdot 4}{3\cdot 5} = \frac{10}{15} + \frac{12}{15} =\frac{22}{15}\)

Divide 22 by 15:

Division

Of the five choices, the closest is 1.45.

Example Question #11 : How To Find The Decimal Equivalent Of A Fraction

Which of the following is a true statement?

Possible Answers:

\(\displaystyle -0.72< -\frac{19}{27}< -0.71\)

\(\displaystyle -0.73< -\frac{19}{27}< -0.72\)

\(\displaystyle -0.75< -\frac{19}{27}< -0.74\)

\(\displaystyle -0.71< -\frac{19}{27}< -0.70\)

\(\displaystyle -0.74< -\frac{19}{27}< -0.73\)

Correct answer:

\(\displaystyle -0.71< -\frac{19}{27}< -0.70\)

Explanation:

Divide 19 by 27:

Division

\(\displaystyle 0.70 < \frac{19}{27}< 0.71\)

so

\(\displaystyle -0.71< -\frac{19}{27}< -0.70\).

Example Question #13 : Decimals With Fractions

Which of the following falls between 0.32 and 0.33?

Possible Answers:

\(\displaystyle \frac{25}{77}\)

\(\displaystyle \frac{23}{77}\)

\(\displaystyle \frac{26}{77}\)

\(\displaystyle \frac{27}{77}\)

\(\displaystyle \frac{24}{77}\)

Correct answer:

\(\displaystyle \frac{25}{77}\)

Explanation:

Since all of the fractions have 77 as a denominator, one way to solve this problem is to let \(\displaystyle N\) be the numerator of the correct fraction. Therefore, the equivalent problem is to find integer \(\displaystyle N\) such that

\(\displaystyle 0.32 < \frac{N}{77} < 0.33\)

Multiply each expression by \(\displaystyle 77\):

\(\displaystyle 0.32 \cdot 77 < \frac{N}{77} \cdot 77 < 0.33 \cdot 77\)

\(\displaystyle 24.64 < N < 25.41\)

Therefore, \(\displaystyle N = 25\), making \(\displaystyle \frac{25}{77}\) the correct choice.

Example Question #1373 : Ssat Upper Level Quantitative (Math)

Which of the following fractions is closest to 0.6?

Possible Answers:

\(\displaystyle \frac{4}{7}\)

\(\displaystyle \frac{9}{16}\)

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

\(\displaystyle \frac{13}{20}\)

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

Correct answer:

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

Explanation:

For each fraction, divide each numerator by its denominator to get its decimal representation, then subtract to find its difference from 0.6.

\(\displaystyle \frac{4}{7} \approx 0.5714 ; 0.6 - 0.5714 =0.0286\)

\(\displaystyle \frac{5}{8}=0.625; 0.625-0.6 = 0.025\)

\(\displaystyle \frac{9}{16} = 0.5625; 0.6-0.5625=0.0375\)

\(\displaystyle \frac{2}{3}\approx 0.6667; 0.6667-0.6=0.0667\)

\(\displaystyle \frac{13}{20} = 0.65; 0.65-0.6=0.05\)

 

\(\displaystyle \frac{5}{8}\) is the closest to 0.6 of the five.

Example Question #1374 : Ssat Upper Level Quantitative (Math)

Give the decimal equivalent of \(\displaystyle \frac{1}{6}\).

Possible Answers:

\(\displaystyle 0.16\)

\(\displaystyle 0.\overline{16}\)

\(\displaystyle 0.1\overline{6}\)

\(\displaystyle 0.167\)

\(\displaystyle 0.166\)

Correct answer:

\(\displaystyle 0.1\overline{6}\)

Explanation:

Divide 1 by 6; the result is 

\(\displaystyle \frac{1}{6}= 1 \div 6 = 0.166666...\) .

That is, the 6 is repeated infinitely. This is equal to \(\displaystyle 0.1\overline{6}\).

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