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Add subt unlike den1

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Transcript

  • 1. Adding and Subtracting fractions with Unlike denominators
  • 2. Rewrite the problem with equivalent fractions
    • List the multiples of both denominators.
    • Find the least common multiple (LCM).
    • Write new fractions with the LCM as the new denominator.
    • Find the factor you multiply by to get from your original denominator to your new denominator.
    • Use that same factor, and multiply it by your original numerator to get a new numerator.
  • 3. WHAT DOES THAT MEAN? Let’s illustrate the steps with an example. 3 4 + 1 6
  • 4. 3 4 + 1 6 Multiples of 4: 4, 8, 12, 16, 20 Multiples of 6: 6, 12, 18, 24, 30 + 12 12 x 3 9 x 2 2 12 11
  • 5. Example 2 9 10 2 5 10, 20, 30, 40, 50 5, 10, 15, 20, 25 10 10 x 1 9 x 2 4 = 10 5 = 1 2
  • 6. Homework Time!