HSPT Math : Fractions

Study concepts, example questions & explanations for HSPT Math

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Example Questions

Example Question #231 : Fractions

Two line segments have lengths of  and   What is the total measurement of these two line segments?

Possible Answers:

Correct answer:

Explanation:

Convert all mixed numbers to improper fractions.

Because the denominators are not the same, find the LCD of 4 and 6.

Multiples of 4 are 4,8,12, 16.

Multiples of 6 are 6 and 12.

The LCM or the LCD of 4 and 6 is 12.  Then, create equivalent fractions.

    Both numerator and denominator were multiplied by 3.

      Both numerator and denominator were multiplied by 2.

 

The sum of the two line segments is 

 

Example Question #231 : Fractions

What is a fraction form of .036?

Possible Answers:

\dpi{100} \frac{9}{250}

\dpi{100} \frac{1}{4}

\dpi{100} \frac{1}{36}

\dpi{100} \frac{36}{100}

Correct answer:

\dpi{100} \frac{9}{250}

Explanation:

The fraction form of .036 is \dpi{100} \frac{36}{1000}.  None of our answers match this fraction, so we must reduce it.  The easiest way to do so is to divide the top and bottom by 2.

\dpi{100} \frac{36}{1000}=\frac{18}{500}

We can divide by 2 again:

\dpi{100} \frac{18}{500}=\frac{9}{250}

This is one of our answers (and also the fraction in its most reduced form).

Example Question #231 : Fractions

\dpi{100} 2\frac{1}{4}+5\frac{4}{5}=

Possible Answers:

\dpi{100} 7\frac{4}{9}

\dpi{100} 7\frac{4}{5}

\dpi{100} 8\frac{1}{20}

\dpi{100} 8

Correct answer:

\dpi{100} 8\frac{1}{20}

Explanation:

First add the whole numbers.

\dpi{100} 2+5=7

Then add the fractions.  In order to this, the fractions need to have a common denominator.  The denominators are 4 and 5, so we need to find the least common multiple of 4 and 5. We can do this by finding all the multiples of the larger number (5) and try to divide each of them by 4.

5: No

10: No

15: No

20: Yes

So the least common multiple is 20.  We can multiply \dpi{100} 4\times 5 to get 20, and \dpi{100} 5\times 4 to get 20.

\dpi{100} \frac{1}{4}+\frac{4}{5}=\frac{5\times 1}{5\times 4}+\frac{4\times 4}{4\times 5}=\frac{5}{20}+\frac{16}{20}=\frac{21}{20}

We convert \dpi{100} \frac{21}{20} to \dpi{100} 1\frac{1}{20} and add it to 7 to get \dpi{100} 8\frac{1}{20}.

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