Finding a Common Denominator to Compare Fractions

LCM is helpful when (2 answers)

• reducing a fraction to its simplest form

• finding a common denominator to compare fractions

• finding a common denominator to add/subtract fractions

• reducing a mixed fraction to improper

Check off everything you need to do before adding/ subtracting fractions:

• find the gcf of all fractions

• find the LCM of all denominators

• find the LCM of all numerators

• make whole numbers over 1

Check all fraction operations that required common denominators:

• addition

• subtraction

• multiplication

• division

• comparing fractions

Finding common denominators is one way to compare two fractions.

• TRUE

• FALSE

Tomas is comparing the fractions 1/3 and 3/4. He rewrites the fractions using a common denominator. His work was all correct. Which shows Tomas's comparison?

• 4/12 < 9/12

• 4/12 > 9/12

• 4/12 = 9/12

• 4/12 < 6/12

What number would you use as the common denominator?

• 40

• 20

• 5

• 10

Choose a common denominator for the fractions below.
4/7 and 3/5

• 12

• 14

• 35

When do we use the LCM?

• subtracting fractions

• adding fractions

• finding a common denominator

• multiplying fractions

• comparing fractions

What is the common denominator?

1/4 ___ 2/3

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