Mastering Addition and Subtraction of Fractions with Unlike Denominators

This video tutorial explains how to add and subtract fractions with different denominators by finding the least common denominator (LCD). It demonstrates the process of converting fractions to have the same denominator using the least common multiple (LCM) and then performing the arithmetic operations. The video concludes with a call to action for viewers to like and subscribe for more content.

Why can't we add fractions with different denominators directly?

• Because the fractions must be mixed numbers

• Because the denominators must be the same

• Because the fractions must be improper

• Because the numerators are different

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the least common multiple (LCM) of 7 and 2?

• 21

• 14

• 28

• 7

How do you find an equivalent fraction?

• By adding the same number to the numerator and denominator

• By subtracting the same number from the numerator and denominator

• By multiplying both the numerator and denominator by the same number

• By dividing both the numerator and denominator by the same number

Tags

CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the equivalent fraction of 2/7 with a denominator of 14?

• 2/14

• 4/14

• 6/14

• 8/14

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the sum of 4/14 and 7/14?

• 11/14

• 9/14

• 10/14

• 12/14

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Why can't we subtract fractions with different denominators directly?

• Because the fractions must be mixed numbers

• Because the numerators are different

• Because the denominators must be the same

• Because the fractions must be improper

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the least common multiple (LCM) of 6 and 9?

• 24

• 18

• 12

• 6

What is the equivalent fraction of 5/6 with a denominator of 18?

• 10/18

• 12/18

• 18/18

• 15/18

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the equivalent fraction of 2/9 with a denominator of 18?

• 8/18

• 2/18

• 4/18

• 6/18

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 4/18 from 15/18?

• 12/18

• 10/18

• 9/18

• 11/18

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D