Adding and Subtracting Fractions with Unlike Denominators

The video tutorial covers the basics of adding and subtracting fractions, starting with common denominators and moving to different denominators. It explains how to find the least common multiple to make denominators the same, and provides examples of adding and subtracting fractions, including mixed numbers. The tutorial emphasizes the importance of not altering denominators during addition or subtraction and concludes with a reminder to simplify fractions.

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

• Add the numerators directly

• Subtract the denominators

• Find a common denominator

• Multiply the fractions

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the result of adding 3/8 and 4/8?

• 12/8

• 7/16

• 1/2

• 7/8

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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

• By listing multiples and finding the lowest common one

• By finding the highest number that divides both

• By multiplying them

• By adding them

What is the common denominator of 1/2 and 1/3?

• 6

• 3

• 5

• 2

After finding the common denominator, what is the next step?

• Add the denominators

• Multiply the fractions

• Adjust the numerators accordingly

• Simplify the fractions

Tags

CCSS.7.NS.A.1C

What do you always do to the numerator when you adjust the denominator?

• Leave it unchanged

• Subtract it by the same number

• Multiply it by the same number

• Divide it by the same number

Tags

CCSS.5.NF.B.5B

What is the result of adding 1/2 and 1/3 after finding a common denominator?

• 2/5

• 5/6

• 4/6

• 3/6

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the common denominator for 1/2 and 2/5?

• 7

• 20

• 10

• 5

How do you convert an improper fraction to a mixed number?

• Subtract the denominator from the numerator

• Add the numerator to the denominator

• Multiply the numerator by the denominator

• Divide the numerator by the denominator

What is the simplified form of 23/21?

• 1 2/21

• 1 1/21

• 1 3/21

• 1