Subtracting Fractions with Unlike Denominators

The video tutorial explains how to subtract fractions with different denominators by finding a common denominator. It demonstrates the process using two examples: subtracting 4/3 and 1/5, and subtracting 7/10 and 5/8. The tutorial emphasizes the importance of finding the least common multiple to rewrite fractions with a common denominator, allowing for straightforward subtraction.

What is the first step in subtracting fractions with different denominators?

• Divide the fractions

• Multiply the fractions

• Find a common denominator

• Add the numerators directly

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the least common multiple (LCM) of 3 and 5?

• 25

• 10

• 15

• 20

To rewrite 4/3 as a fraction with a denominator of 15, what should you multiply the numerator and denominator by?

• 3

• 4

• 5

• 6

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is 4/3 rewritten as a fraction with a denominator of 15?

• 12/15

• 16/15

• 20/15

• 24/15

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is 1/5 rewritten as a fraction with a denominator of 15?

• 3/15

• 5/15

• 2/15

• 4/15

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 3/15 from 20/15?

• 15/15

• 19/15

• 18/15

• 17/15

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the least common multiple (LCM) of 10 and 8?

• 30

• 40

• 20

• 50

To rewrite 7/10 as a fraction with a denominator of 40, what should you multiply the numerator and denominator by?

• 4

• 3

• 2

• 5

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is 7/10 rewritten as a fraction with a denominator of 40?

• 32/40

• 24/40

• 28/40

• 21/40

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 25/40 from 28/40?

• 2/40

• 1/40

• 3/40

• 4/40

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D