Adding Fractions with Unlike Denominators

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

• Add the numerators directly

• Subtract the numerators

• Find the lowest common denominator

• Multiply the denominators

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Why is it necessary to find a common denominator when adding fractions?

• To make the fractions larger

• Because it's a mathematical rule

• To ensure accuracy in addition

• To simplify the fractions

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

How do you find the lowest common denominator of two fractions?

• Add the two denominators

• Find the highest number that divides both

• Multiply the two denominators

• List multiples of each denominator and find the first common one

What is the lowest common denominator of 5 and 4?

• 40

• 10

• 20

• 9

What does the lowest common denominator represent in fraction addition?

• The smallest fraction possible

• The product of both denominators

• The smallest number both denominators can divide into

• The sum of both denominators

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

To convert the denominator 5 to 20, by what factor should you multiply?

• 4

• 6

• 3

• 5

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

When converting fractions to have the same denominator, what must you do to the numerator?

• Divide by the same factor as the denominator

• Multiply by the same factor as the denominator

• Leave it unchanged

• Subtract the same factor as the denominator

After adjusting the fractions to have the same denominator, what is the next step?

• Add the numerators

• Add the denominators

• Multiply the numerators

• Reduce the fractions

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the result of adding 3/5 and 1/4 after finding a common denominator?

• 15/19

• 22/25

• 8/9

• 17/20

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the final step in adding fractions with the same denominator?

• Add the numerators and keep the denominator

• Both B and C

• Reduce the fraction to its simplest form

• Multiply the denominators

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D