To express 0.8 as a fraction, we start by recognizing that 0.8 means 8 tenths. This can be written as:
0.8 = 8/10
Next, we simplify the fraction by finding the greatest common divisor (GCD) of the numerator and the denominator. The GCD of 8 and 10 is 2. We can divide both the numerator and the denominator by 2:
(8 ÷ 2) / (10 ÷ 2) = 4/5
Thus, the simplest form of 0.8 as a fraction is:
4/5