HSPT Math : Concepts

Study concepts, example questions & explanations for HSPT Math

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Example Questions

Example Question #521 : Concepts

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 #521 : Arithmetic

What is a fraction form of .036?

Possible Answers:

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

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

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

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

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 #522 : Arithmetic

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

Possible Answers:

\dpi{100} 8

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

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

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

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}.

Example Question #521 : Concepts

What is 32% of 2,000?

Possible Answers:

Correct answer:

Explanation:

Taking 32% of a number is the same as multiplying that number by 0.32. We therefore take the product:

Example Question #522 : Concepts

Which of the following operations is equivalent to taking  of a number?

Possible Answers:

Dividing the number by

Dividing the number by

Dividing the number by

Moving the decimal point one place to the left, then doubling the result

Moving the decimal point one place to the left, then tripling the result

Correct answer:

Dividing the number by

Explanation:

Let's just pick a number at random, for example

of this number is , which is  divided by .

We can also work by simplifying the fractional form of . A percent can be written as the number divided by .

We can simplify this fraction: .

Either way, we get the same answer.

Example Question #3 : Percentages

What percent of 12,000 is 3,300?

Possible Answers:

25%

27.5%

26%

24.5%

28.5%

Correct answer:

27.5%

Explanation:

To find out what percent a part  is of a whole , evaluate the expression 

 

Example Question #4 : Percentages

 is  of what number?

Possible Answers:

Correct answer:

Explanation:

If  is  of a number, , then we can set up an equation. First, we convert to a decimal, . Then, we can formulate the equation below.

Solve for by dividing both sides of the equation by .

Example Question #523 : Concepts

Which is larger?

a. 10% of 90

b. 5% of 160

c. 20% of 50

d. 30% of 40

Possible Answers:

Correct answer:

Explanation:

First find the percentage amount for each choice by multiplying the number by the percentage amount

a.

b.

c.

d.

Then compare the amounts to find the largest.

The answer is (d) 12.

Example Question #1121 : Hspt Mathematics

75 is 60% of what number?

Possible Answers:

Correct answer:

Explanation:

Set up the proportion statement and solve for  by cross-multiplying:

Example Question #6 : Percentages

What is 120% of 120?

Possible Answers:

Correct answer:

Explanation:

Rewrite 120% as a decimal by writing 120 with a decimal point, then shifting it two spaces left:

Multiply this by 120:

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