Subtracting Fractions With Uncommon Denominators

If a piece of wood is 5/8 inch long and you cut off 3/16 inch, how long is the remaining piece?

• 5/16 inch

• 7/16 inch

• 3/8 inch

• 1/2 inch

A rope is 7/8 yard long. If you cut off 1/4 yard, how long is the remaining rope?

• 1/2 yard

• 2/3 yard

• 5/8 yard

• 3/4 yard

1/2 - 1/4 =

• 3/4

• 1/4

• 1

• 1/2

3/4 - 3/5 =

• 6/9

• 9/20

• 15/20

• 3/20

Solve and simplify if needed:

1/3 - 1/5 =

Mathematical Equivalence

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What is the first step to add or subtract fractions with different denominators?

• Multiply the numerators

• Find a common denominator

• Convert the fractions to have the same numerator

• Add or subtract the denominators

What is the first step in adding or subtracting fractions?

• Divide the denominators

• Add the numerators

• Multiply the numerators

• Find a common denominator

What is the process of finding a common denominator for fractions?

• Find the least common multiple (LCM) of the denominators

• Ensure the fractions have the same denominator

• Add or subtract the numerators

• Divide both the numerator and denominator by their greatest common divisor (GCD)

What is the first step for adding or subtracting fractions?

• Add or subtract the numerators

• Ensure the fractions have the same denominator

• Simplify the resulting fraction

• Find a common denominator

What should be done after finding a common denominator?

• Multiply the denominators

• Add or subtract the numerators

• Multiply the numerators

• Divide the denominators