Subtracting Rational Numbers
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Objective
I can subtract rational numbers.
Part 1 of 4
Warm-up video
Khan Academy · 10:23Vetted 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
When subtracting fractions or rational numbers, you must first find a common denominator.
- 2
To find a common denominator, you can multiply the denominators or find their least common multiple.
- 3
After finding a common denominator, you subtract the numerators and keep the common denominator to get the final answer.
Part 3 of 4
Practice
3 questions
Subtract the following rational numbers: 4/5 - 1/3. Show your work.
Calculate the difference: 8/9 - 2/12. Make sure your final answer is in simplest form.
Part 4 of 4
Exit ticket
Quick comprehension check
“Subtract 5/12 - 7/18. Show all steps, including how you found the common denominator.”
Sample answer included in the free materials
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