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LCM for Fraction Pairs
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LCM for Fraction Pairs
🎯 Learning Goals
I can... find the least common multiple (LCM) of denominators to compare and add fractions.
Success Criteria:
- I can identify the denominators in fraction pairs
- I can find the LCM of two numbers using listing or prime factorization
- I can use the LCM as a common denominator for fractions
📚 Part 1: Finding LCM for Denominators
1. Find the LCM of the denominators for 1/4 and 1/6.
10
12
24
8
2. What is the LCM of 8 and 12?
3. Find the LCM for these fraction pairs:
a) 3/5 and 2/15: LCM = _______
b) 1/6 and 5/9: LCM = _______
c) 2/3 and 7/12: LCM = _______
4. Which pairs have an LCM of 20? Check all that apply:
1/4 and 3/5
2/10 and 1/20
3/4 and 7/10
1/5 and 3/20
✏️ Part 2: Apply Your Knowledge
5. Maya wants to add 2/3 + 1/4. What should be her first step?
6. Show your work to find the LCM of 9 and 15 using the listing method:
7. Challenge: Find the LCM for three denominators: 4, 6, and 8
8. Explain why finding the LCM is important when working with fractions:
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