To divide by a fraction, simply multiply by its reciprocal. So 3/5 divided by 3/15 is the same as 3/5 multiplied by 15/3. To multiply the fractions, just multiple the numerators together and multiply the denominators together. 3/5 * 15/3 = 45/15 Simply the fraction by dividing top and bottom by 15 giving 3/1 and 3/1 is equal to 3
