The number 21 can be expressed as a fraction in its simplest form by placing it over the number 1. Thus, 21 as a fraction is:
21/1
In terms of fractions, simplifying involves ensuring that the numerator and denominator share no common factors other than 1.
Since 21 is a whole number and 1 is the only whole number that can divide any whole number, the fraction 21/1 is already in its simplest form.
To further illustrate:
- The numerator (21) is a whole number.
- The denominator (1) is the defining factor for any whole number, making it effectively a representation of that number without alteration.
Therefore, if you’re looking to express 21 as a fraction, simply utilizing 21/1 is both correct and straightforward. It’s important to note that many people may refer to 21 itself without thinking of it in fractional terms, but mathematically, this is the representation you would use.