Finding Least Common Multiples and Equivalent Fractions

This video tutorial teaches how to add and subtract fractions by finding their least common denominator. It provides a three-step method to solve fraction problems, demonstrated through two examples: one for addition and one for subtraction. The tutorial emphasizes the importance of rewriting fractions with a common denominator before performing arithmetic operations.

What is the first step in adding or subtracting fractions?

• Find the greatest common factor

• Find the least common denominator

• Multiply the numerators

• Divide the denominators

In the first example, what fractions are being added?

• 2/5 and 1/3

• 3/4 and 2/5

• 1/4 and 1/5

• 1/2 and 1/3

How do you find the least common multiple of two numbers?

• Add the numbers together

• Subtract the smaller number from the larger one

• Multiply the numbers

• List the multiples and find the smallest common one

What is the least common multiple of 5 and 3?

• 10

• 25

• 15

• 20

What is the equivalent fraction of 2/5 with a denominator of 15?

• 6/15

• 5/15

• 4/15

• 3/15

What is the equivalent fraction of 1/3 with a denominator of 15?

• 4/15

• 6/15

• 3/15

• 5/15

What is the result of adding 6/15 and 5/15?

• 11/15

• 13/15

• 10/15

• 12/15

In the second example, what fractions are being subtracted?

• 1/4 from 1/5

• 3/4 from 2/5

• 2/5 from 3/4

• 1/2 from 1/3

What is the least common multiple of 4 and 5?

• 30

• 25

• 20

• 15

What is the equivalent fraction of 3/4 with a denominator of 20?

• 18/20

• 12/20

• 15/20

• 20/20