Multiply whole numbers by fractions quiz. This is an online math test in which two values are being multiplied. One number is a whole number while one is a fraction. To make it easy, place the whole number over one as a denominator. After doing so, multiply following the same rules as you would while multiplying two fractions. Check your answer as you go along. The advantage with this quiz is that there is an answer key that checks your answer as you take the test. Help students in 3rd, 4th, 5th and 6th grade to improve their skills in multiplication of fractions by whole numbers.