Compare 15/4 and 17/5

1 answer

To compare the two fractions \( \frac{15}{4} \) and \( \frac{17}{5} \), we can find a common denominator or convert them to decimal form.

  1. Finding a common denominator: The least common multiple (LCM) of the denominators 4 and 5 is 20.

    • Convert \( \frac{15}{4} \) to have a denominator of 20: \[ \frac{15}{4} = \frac{15 \times 5}{4 \times 5} = \frac{75}{20} \]

    • Convert \( \frac{17}{5} \) to have a denominator of 20: \[ \frac{17}{5} = \frac{17 \times 4}{5 \times 4} = \frac{68}{20} \]

Now, we can compare \( \frac{75}{20} \) and \( \frac{68}{20} \):

  • Since 75 is greater than 68, we have: \[ \frac{75}{20} > \frac{68}{20} \]

Thus: \[ \frac{15}{4} > \frac{17}{5} \]

  1. Converting to decimal form:
    • Convert \( \frac{15}{4} \): \[ 15 \div 4 = 3.75 \]

    • Convert \( \frac{17}{5} \): \[ 17 \div 5 = 3.4 \]

Since \( 3.75 > 3.4 \), it also confirms that: \[ \frac{15}{4} > \frac{17}{5} \]

Therefore, \( \frac{15}{4} \) is greater than \( \frac{17}{5} \).