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15. Express the fractions [tex]\frac{3}{4}, \frac{7}{16},[/tex] and [tex]\frac{5}{8}[/tex] with the LCD.

A. [tex]\frac{24}{32}, \frac{14}{32}, \frac{24}{32}[/tex]
B. [tex]\frac{9}{16}, \frac{49}{16}, \frac{36}{16}[/tex]
C. [tex]\frac{3}{4}, \frac{2}{4}, \frac{3}{4}[/tex]
D. [tex]\frac{12}{16}, \frac{7}{16}, \frac{10}{16}[/tex]


Sagot :

To solve the problem of expressing the fractions \(\frac{3}{4}\), \(\frac{7}{16}\), and \(\frac{5}{8}\) with a common denominator, follow these steps:

1. Identify the denominators of the given fractions:
- The denominators are \(4\), \(16\), and \(8\).

2. Find the Least Common Denominator (LCD):
- The LCD of the denominators \(4\), \(16\), and \(8\) is \(16\).

3. Express each fraction with the LCD:
- For \(\frac{3}{4}\):
- Convert the denominator \(4\) to \(16\). Multiply both the numerator and the denominator by \(4\):
[tex]\[ \frac{3}{4} = \frac{3 \times 4}{4 \times 4} = \frac{12}{16} \][/tex]

- For \(\frac{7}{16}\):
- The denominator is already \(16\).
[tex]\[ \frac{7}{16} = \frac{7}{16} \][/tex]

- For \(\frac{5}{8}\):
- Convert the denominator \(8\) to \(16\). Multiply both the numerator and the denominator by \(2\):
[tex]\[ \frac{5}{8} = \frac{5 \times 2}{8 \times 2} = \frac{10}{16} \][/tex]

4. Combine the results as fractions with the common denominator \(16\):
- The fractions \(\frac{3}{4}\), \(\frac{7}{16}\), and \(\frac{5}{8}\) are expressed as \(\frac{12}{16}\), \(\frac{7}{16}\), and \(\frac{10}{16}\), respectively.

So, the best answer is:

D. [tex]\(\frac{12}{16}, \frac{7}{16}, \frac{10}{16}\)[/tex]