Practice marking fractions on a number line with this interactive exercise. You will be shown a number line, and you drag a dot to the correct place to represent the given fraction (standard CCSS.3.NF.A.2).
You can choose to work with proper or improper fractions and/or mixed numbers. Proper fractions are the easiest, whereas placing an improper fraction on a number line probably requires you to change it to a mixed number first. You also have the option of practicing with positive or negative fractions, or both.