Which sentence has an error in comma usage? 1.lauren bought a package of paper, a box of pencils, and a notebook. 2.my brother was sleeping, and my father was watching television. 3.donna likes biology, it is her favorite subject. 4.nathan finished his homework, so he went to the movies.

They consist of a numerator, number on top, and a denominator, number on bottom. When you learned to add and subtract fractions, you learned that you must first have like denominators, meaning the denominators are the same number, and the denominators stayed the same when you were adding or subtracting the fractions. This means that it is possible to factor out a common number from both the numerator and denominator. Multiplying fractions does not require that the fractions have the same denominator. Instead, the numerators are multiplied with each other and the denominators are multiplied with each other.

Step-by-step explanation: