Fraction Common Denominator

You must find the (a)   before you can add or subtract fractions with unlike denominators.

• common denominator

• common numerator

• multiple

• simplified fraction

Find a common denominator for the fractions $rac{5}{8}$ and $rac{3}{10}$.

• 30

• 40

• 50

• 60

Tags

DOK Level 2: Skill/Concept

CCSS.4.NF.A.2

When you ________________________ fractions, you need to 1st find a common denominator.

• multiply

• divide

• add and subtract

• subtract

Match the following fractions with the correct common denominator.

• 10

• 14

• 6

• 24

What would be the common denominator for adding 3/9 + 4/6?

• 9

• 12

• 18

• 27

Which 2 expressions​ do you need to find Common Denominators for?​ (a)   ​ (b)  

Mathematical Equivalence

ON

• 10

• 15

• 20

• 25

Find equivalent fractions with common denominators for the problem shown above.

• 4/15 and 2/15

• 24/30 and 20/30

• 12/15 and 2/15

• 12/15 and 10/15

Which number would you use as the common denominator?

• 10

• 5

• 1

• 25