Question: I’m trying to calculate what percentage is 15 out of 20. How do I do that?

MathBlog: A percent tells us how many parts out of 100 something is. To write a percent as a fraction, just remove the percent symbol and write the number over 100 as the denominator. Below we explain what is 15 out of 20 in percentage, and how you calculate it.

What is 15/20 in percentage?

Answer: 15 is 75% out of 20.

We have two methods to figure out what is 15/20 in percent, with steps for easy understanding.

Method 1: Long division with remainder

Calculate \( 15:20 \)

  1. 20 enters into 15, 0 times, remainder 15
    Result (ongoing) = 0.
    Multiply the remainder by 10 to get 150. Now calculate 150 : 20
  2. 20 enters into 150, 7 times, remainder 10
    Result (ongoing) = 0.7
    Multiply the remainder by 10 to get 100. Now calculate 100 : 20
  3. 20 enters into 100, 5 times, remainder 0
    Remainder = 0, means you're done.
    Result (final) = 0.75

Now you multiply the reults by 100 \( (0.75 \times 100 = 75 ) \) and you get 75%.

Solution: 15 out of 20 equals 75%.

Method 2: Using fractions

Calculate \( P(\text{%}) = \frac{ 15 }{ 20 } \times 100 \)

  1. We need to get the fraction to be of the type \( \frac{ P }{ 100 } \times 100 \)

  2. In our case we need \( \frac { 15 \times x }{ 20 \times x } \times 100 \)

    That means \( 20 \times x = 100 \)

    \( x = \frac{100}{ 20 } = 5 \)

  3. Our fraction is now \( \frac { 15 \times 5 }{ 20 \times 5 } \times 100 \)

  4. We know that the denominator \( 20 \times 5 = 100 \) so we construct the fraction again.

    \( P = \frac { 15 \times 5 }{100} \times 100 \)
    \(= 15 \times 5 \)

  5. Since \( 15 \times 5 = 75 \), we have our result
    \( P = 75 \).

Solution: 15 out of 20 equals 75%.

Calculate other numbers

Calculate percentage of two numbers