Subtracting a rational expression from a whole number

The video tutorial covers the process of adding and subtracting fractions, emphasizing the importance of having common denominators. It explains how to find the least common denominator (LCD) and demonstrates the steps to add and subtract fractions with different denominators. The tutorial uses examples to illustrate these concepts, ensuring that learners understand the need for common denominators in fraction operations.

Why is it necessary to have the same denominator when adding or subtracting fractions?

• To accurately combine the fractions

• To simplify the fractions

• To make the fractions improper

• To ensure the numerators are equal

What is the least common denominator (LCD) for the fractions 1/4 and 1/3?

• 6

• 4

• 12

• 3

After finding the LCD, what is the next step in adding fractions with different denominators?

• Convert the fractions to have the same denominator

• Add the numerators directly

• Subtract the smaller fraction from the larger one

• Multiply the fractions

In the subtraction example, what operation is applied to the numerator after ensuring the denominators are the same?

• Addition

• Multiplication

• Subtraction

• Division

What is the result of subtracting 5 from 18 in the example provided?

• 11

• 23

• 13

• 15