Adding and Subtracting Fractions
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Objective
I can add and subtract fractions by finding a common denominator.
Part 1 of 3
Key concepts
3 concepts
- 1
When adding or subtracting fractions, you must find a common denominator to ensure you are working with same-sized pieces.
- 2
A common denominator is a number that both original denominators can divide into evenly, and the easiest one to use is often the least common multiple (LCM).
- 3
Once fractions have a common denominator, you can add or subtract their numerators, and the denominator will remain unchanged.
Part 2 of 3
Practice
3 questions
Explain why finding a common denominator is an essential first step when adding or subtracting fractions.
Add the following fractions: 1/3 + 1/5. Show the steps you take to find the common denominator and the equivalent fractions.
Part 3 of 3
Exit ticket
Quick comprehension check
“Add the fractions ⅔ + ⅕. Show all steps, including how you found the common denominator and converted the fractions.”
Sample answer included in the free materials
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