Easy way to subtract two fractions with unlike denominators to determine the difference

The video tutorial covers adding and subtracting fractions with unlike denominators. It explains the concept of the least common denominator (LCD) and how to find it by multiplying denominators. The tutorial provides examples to illustrate when multiplying denominators gives the correct LCD and when it does not. It then demonstrates how to apply the LCD to perform fraction operations, ensuring equivalent equations by multiplying both the numerator and denominator. The tutorial concludes with a final calculation example, showing how to subtract fractions with a common denominator.

What is the first step in adding or subtracting fractions with unlike denominators?

• Subtract the numerators

• Add the denominators

• Multiply the numerators

• Find the least common denominator

Which of the following is a method to find the least common denominator?

• Multiply the denominators

• Subtract the denominators

• Add the numerators

• Divide the numerators

If the denominators are 9 and 3, what is the least common denominator?

• 3

• 9

• 18

• 27

When adjusting fractions to have a common denominator, what must you do to the numerators?

• Subtract them

• Multiply them by the same factor as the denominator

• Add them together

• Divide them by the denominator

In the example given, what is the final result of subtracting the fractions?

• -14/21

• 23/21

• -23/21

• -9/21