Final answer:
5.225 as an improper fraction = 209/40.
Step-by-step explanation:
To express 5.225 as an improper fraction, we need to first convert the decimal to a fraction.
The decimal point is after the thousandths place, so we can write it as 5225/1000 because there are 1000 thousandths in a whole.
Simplifying the fraction, we divide both the numerator and denominator by their greatest common factor, which is 25.
Therefore, the improper fraction form of 5.225 is 209/40.