you have two fractions 2/5 and 3/10 and you want to rewrite them so that they have the same denominator what numbers could you use for the denominator is it A 20 or B 10 or C5 or D 15

Respuesta :

By definition, a fraction has the following form:

[tex]\frac{a}{b}[/tex]

When "a" is the numerator and "b" is the denominator.

In this case you have the following fractions:

[tex]\begin{gathered} \frac{2}{5} \\ \\ \frac{3}{10} \end{gathered}[/tex]

Notice that the denominator of the first fraction is 5 and the denominator of the second fraction is 10.

The steps to find the a Common denominator are shown below:

1. Descompose 5 and 10 into their Prime factors:

[tex]\begin{gathered} 5=5 \\ 10=2\cdot5 \end{gathered}[/tex]

2. In this case, you need to choose 5, because it is the common one. It will be the Common denominator of the fractions.

3. Divide the original denominator of the first fraction by the Common denominator 5. Multiply the the numerator by the result. Then:

[tex]\frac{2}{5}=\frac{2\cdot1}{5}=\frac{2}{5}[/tex]

4. Apply the procedure explained in step 3 to the second fraction:

[tex]\frac{3}{10}=\frac{3\cdot2}{5}=\frac{6}{5}[/tex]

5. You can identify that you can also get a common denominator multiplying the denominators and the numerators of both fractions by

The answer is: Option C.