To express 63 as a fraction, we can consider it as 63 over 1. This means that 63 is a whole number and when represented in fraction form, it is simply written as:
63/1
In this fraction, 63 is the numerator and 1 is the denominator. Since any whole number can be expressed as a fraction by putting it over 1, 63 is no exception. Thus, 63 as a fraction is 63/1.