The mixed number 21 80/100 as a decimal is equal to 21.8
To convert the mixed number 21 80/100 into a decimal number, you can follow these steps:
First, convert the fractional part 80/100 to decimal form by dividing the numerator by the denominator: 80 ÷ 100 = 0.8
Then, add the resulting decimal to the integer part of the mixed number: 21 + 0.8
Alternatively, you can convert mixed numbers to improper fractions first and then convert the improper fraction to a decimal. The calculation formula is as follows:
Therefore, the mixed number 21 80/100 as a decimal is 21.8.
See also: 21 80/100 as an improper fraction