Finding Least Common Multiples and Renaming Fractions

This video tutorial by Mr. J covers how to add and subtract fractions with unlike denominators. It includes two examples each for addition and subtraction, demonstrating the process of finding a common denominator, renaming fractions, and performing the arithmetic operations. The video emphasizes the importance of using the least common multiple to simplify calculations and provides step-by-step guidance for each example.

Why is it necessary to find a common denominator when adding fractions with unlike denominators?

• To simplify the fractions

• To ensure the fractions have the same value

• To make the denominators the same for addition

• To make the numerators equal

What is the least common multiple of 9 and 3?

• 3

• 27

• 9

• 18

How do you rename 1/3 to have a denominator of 9?

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 9

• Add 6 to the numerator

• Divide the numerator by 3

What is the least common multiple of 10 and 6?

• 10

• 40

• 30

• 20

How do you rename 3/10 to have a denominator of 30?

• Divide the numerator by 3

• Add 20 to the numerator

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 2

Why is it important to find the least common multiple when subtracting fractions?

• To make the denominators the same for subtraction

• To simplify the fractions

• To ensure the fractions have the same value

• To make the numerators equal

What is the least common multiple of 6 and 12?

• 6

• 24

• 12

• 18

How do you rename 5/6 to have a denominator of 12?

• Add 6 to the numerator

• Divide the numerator by 2

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 2

What is the least common multiple of 10 and 4?

• 40

• 10

• 30

• 20

How do you simplify the fraction 8/20?

• Add 12 to the numerator

• Multiply both numerator and denominator by 2

• Divide both numerator and denominator by 4

• Divide both numerator and denominator by 2