Translate word phrases to expressions with fractions

Simplify complex fractions

Translate Phrases to Expressions with Fractions

The words quotient and ratio are often used to describe fractions. Earlier, we defined quotient as the result of division. The quotient of [latex]a\text{ and }b[/latex] is the result you get from dividing [latex]a\text{ by }b[/latex], or [latex]\Large\frac{a}{b}[/latex]. Let’s practice translating some phrases into algebraic expressions using these terms.

Example

Translate the phrase into an algebraic expression: “the quotient of [latex]3x[/latex] and [latex]8[/latex].”

Solution:
The keyword is quotient; it tells us that the operation is division. Look for the words of and and to find the numbers to divide.

[latex]\text{The quotient }\text{of }3x\text{ and }8\text{.}[/latex]

This tells us that we need to divide [latex]3x[/latex] by [latex]8[/latex].

[latex]\Large\frac{3x}{8}[/latex]

try it

Example

Translate the phrase into an algebraic expression: the quotient of the difference of [latex]m[/latex] and [latex]n[/latex], and [latex]p[/latex].

Show Solution

Solution:
We are looking for the quotient of the difference of [latex]m[/latex] and [latex]n[/latex], and [latex]p[/latex]. This means we want to divide the difference of [latex]m[/latex] and [latex]n[/latex] by [latex]p[/latex]

[latex]\Large\frac{m-n}{p}[/latex]

Try it

In the following video we show more examples of translating English expressions into algebraic expressions.

Simplify Complex Fractions

Our work with fractions so far has included proper fractions, improper fractions, and mixed numbers. Another kind of fraction is called complex fraction, which is a fraction in which the numerator or the denominator contains a fraction.
Some examples of complex fractions are:

[latex]\LARGE\frac{\frac{6}{7}}{ 3}, \frac{\frac{3}{4}}{\frac{5}{8}}, \frac{\frac{x}{2}}{\frac{5}{6}}[/latex]
To simplify a complex fraction, remember that the fraction bar means division. So the complex fraction [latex]\LARGE\frac{\frac{3}{4}}{\frac{5}{8}}[/latex] can be written as [latex]\Large\frac{3}{4}\normalsize\div\Large\frac{5}{8}[/latex].

Simplify Complex Fractions (2/3)/(5/6) and (-8/7)/4. Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. Located at: https://youtu.be/T1PIfrU3NTw. License: CC BY: Attribution

Simplify Complex Fractions (8/5)/(3 1/2) and (a/8)/((ab)/8). Authored by: James Sousa (Mathispower4u.com) for Lumen Learning. Located at: https://youtu.be/H5K4ESHLBks. License: CC BY: Attribution

Prealgebra. Provided by: OpenStax. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/contents/caa57dab-41c7-455e-bd6f-f443cda5519c@9.757