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1. Adding Fractions with Common Denominators
Add the Numerators.
Keep the Denominators the same.
2. Practice time
3. Reduce or simplify if necessary…
4. Adding Fractions with Unlike Denominators
5.Find a common denominator using LCM.
Multiply numerator and denominator by LCM.
Add the converted fractions.
6. Least Common Multiple
7. We need to create fractions with like denominators in order to add these fractions. This is where we need LCM (Least Common Multiples)
8. The first common multiple is the Least Common Multiple
This will become the new denominators in order to create like denominators to add fractions.
9. Adding Fractions with Unlike Denominators
Multiples of 7: 7, 14, 21, 28
Multiples of 4: 4, 8, 12, 16, 20, 24, 28
10. Practice time
Common Multiples for these numbers:
What is the LCM?
In order to add fractions, what must you have?
Explain a simplified fraction
What is an LCM?
What are LCMs used for?
Why is it important to be able to find an LCM?