When you multiply fractions, just multiply the numerator by the numerator, and the denominator by the denominator. The result of the numerator multiplication will be the numerator of the answer and the result of the denominator multiplication will be the denominator of the answer. After you multiply the fractions, you might need to reduce the result.
Multiplying a Fraction by a Whole Number
If you need to multiply a fraction by a whole number, you should convert the whole number to an improper fraction where that number is the numerator and 1 is the denominator.
Converting an Improper Fraction to a Whole Number
You might then need to convert this improper fraction of 28/5 to a mixed number in order to choose the correct answer. This is done by dividing the numerator, 28, by the denominator, 5, and leaving the remainder as the numerator of the fraction and the denominator unchanged.
Multiplying a Fraction by a Mixed Number and Converting Mixed Numbers to Improper Fractions
If you need to multiply a fraction by a mixed number, first convert the mixed number to an improper fraction. The way to convert a mixed number to an improper fraction is by multiplying the whole number of the mixed number by the denominator and adding this product to the numerator.
The way you divide a fraction by a fraction is by flip-flopping the second fraction (replace the numerator with the denominator and the denominator with the numerator) and then multiplying the fractions.