Common Denominators

To add or subtract fractions, you need a ______________ denominator.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

List the multiples of 3 and 5. What is the first common multiple you list?

• 8

• 15

• 5

• 12

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

Tags

CCSS.7.NS.A.1C

Write you multiples for 3 and 4. What is the first common multiple you find on your list?

• 7

• 9

• 12

• 8

 $\frac{1}{3}+\frac{2}{6}=\frac{3}{9}$  Did this student add unlike fractions correctly?

• Yes, they totally have the skill!

• No, they are not ready to add unlike fractions!

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which fraction renames 3/4 with a denominator of 12?

• 3/12

• 4/12

• 12/12

• 9/12

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Which fraction equals 1 whole?

• $\frac{1}{2}$

• $\frac{8}{8}$

• $\frac{2}{3}$

• $\frac{1}{2}$

Tags

CCSS.3.G.A.2

What step should you do first when adding fractions with unlike denominators?

• Just add the denominators together

• Find a common denominator

• Add the numerators together first

• Chang each numerator to be the same

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2