Finding Common Denominators in Fractions

This video tutorial teaches students how to subtract fractions by finding a common denominator. It includes two examples: subtracting 3/2 and 1/8, and subtracting 8/5 and 2/15. The video explains the use of prime factorization to find the least common denominator (LCD) and demonstrates how to adjust numerators accordingly. The tutorial concludes with a recap of the method and encourages viewers to like and subscribe for more math content.

What is the first step in subtracting fractions?

• Divide the fractions

• Multiply the denominators

• Find a common denominator

• Add the numerators

In the first example, what are the denominators of the fractions being subtracted?

• 3 and 2

• 1 and 8

• 2 and 8

• 3 and 8

Which method is used to find the common denominator in the first example?

• Decimal conversion

• Fraction inversion

• Prime factorization

• Cross-multiplication

What is the least common denominator (LCD) for the fractions 3/2 and 1/8?

• 6

• 8

• 4

• 10

What is the common denominator for the fractions 3/2 and 1/8?

• 10

• 8

• 6

• 4

What is the final result of subtracting 3/2 and 1/8?

• 12/8

• 10/8

• 11/8

• 13/8

What is the result of 3 times 4 in the first example?

• 11

• 10

• 12

• 13

In the second example, what are the denominators of the fractions being subtracted?

• 5 and 15

• 2 and 15

• 8 and 5

• 8 and 15

What is the least common denominator (LCD) for the fractions 8/5 and 2/15?

• 20

• 12

• 10

• 15

What is the least common denominator for the fractions 8/5 and 2/15?

• 12

• 20

• 15

• 10