Adding and Subtracting Fractions
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Objective
I can add and subtract fractions with unlike denominators, including simplifying the resulting fraction.
Part 1 of 4
Warm-up video
Khan Academy · 7:23Vetted channel
We don't generate video — this one is by Khan Academy on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
To add fractions with unlike denominators, you must first find a common denominator by determining the least common multiple of the original denominators.
- 2
Once a common denominator is found, rewrite each fraction with the new denominator by multiplying both the numerator and denominator by the same factor.
- 3
After adding the fractions, simplify the result if possible by finding a common factor of the numerator and denominator and dividing both by it.
Part 3 of 4
Practice
9 questions
What is the first step in adding or subtracting fractions with unlike denominators?
Explain how to find the least common multiple (LCM) of two numbers.
Part 4 of 4
Exit ticket
Quick comprehension check
“Solve: ⅚ - ⅜. Show all steps, including finding a common denominator and simplifying your answer.”
Sample answer included in the free materials
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