Adding and Subtracting Fractions with Unlike Denominators

This video tutorial reviews how to add and subtract fractions with unlike denominators, applying these skills to the order of operations. The lesson includes a refresher on converting mixed numbers to improper fractions, finding the least common multiple, and simplifying results. Students are encouraged to engage with practice problems and are given hints to avoid common errors. The tutorial concludes with advanced problems and a summary of key points.

Why is it important to watch the entire video?

• To get extra credit

• To respond to random questions

• To understand the lesson better

• To avoid homework

Tags

CCSS.RI.6.7

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RL.6.7

CCSS.RL.7.7

What is the first step in adding or subtracting fractions with unlike denominators?

• Convert mixed numbers to improper fractions

• Find the least common multiple (LCM)

• Add the numerators

• Simplify the fractions

Tags

CCSS.7.NS.A.1C

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

• Subtract the denominators

• Find the smallest number that both denominators divide into

• Multiply the denominators

• Add the denominators

What should you do after finding the LCM of the denominators?

• Rewrite the fractions with the LCM as the new denominator

• Add the fractions directly

• Subtract the fractions directly

• Convert the fractions to mixed numbers

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

In the example 13/12 + 3/4, what is the LCM of the denominators?

• 24

• 16

• 12

• 4

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

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

• Multiply the whole number by the denominator and add the numerator

• Subtract the numerator from the denominator

• Add the whole number to the numerator

• Multiply the numerator by the denominator

What is the result of 9/4 - 5/8?

• 1 1/8

• 2 5/8

• 2 1/8

• 1 5/8

Tags

CCSS.7.NS.A.1C

What is the simplified form of 1 and 10/12?

• 1 and 2/3

• 1 and 1/2

• 1 and 3/4

• 1 and 5/6

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the LCM of 4 and 7?

• 14

• 35

• 21

• 28

What is the final answer for 35/8 + 9/10?

• 6 and 7/40

• 5 and 3/40

• 5 and 7/40

• 6 and 3/40

Tags

CCSS.7.NS.A.1C