2 25 Adding   Subtracting Mixed Numbers
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2 25 Adding Subtracting Mixed Numbers

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    2 25 Adding   Subtracting Mixed Numbers 2 25 Adding Subtracting Mixed Numbers Presentation Transcript

    • Adding & Subtracting Mixed Numbers
      12/10/09
      EQ: How do I add or subtract mixed numbers?
      12/9/2009
      1
      Bitsy Griffin Lessons 2-24 & 25
    • Review:
      How do you add fractions with the same denominator?
      12/9/2009
      2
      Bitsy Griffin Lessons 2-24 & 25
    • Review:
      How do you add fractions with the different denominators?
      12/9/2009
      3
      Bitsy Griffin Lessons 2-24 & 25
    • Review:
      How do you simplify a fraction?
      12/9/2009
      4
      Bitsy Griffin Lessons 2-24 & 25
    • Suggestions:
      Estimate approximate answer
      + / - fractions.
      Denominators unlike?
      12/9/2009
      5
      Bitsy Griffin Lessons 2-24 & 25
    • Suggestions:
      Simplify the fraction.
      you may end up with a fraction > 1
      In subtraction, you may have to rename!
      12/9/2009
      6
      Bitsy Griffin Lessons 2-24 & 25
    • Suggestions:
      + / - whole numbers
      Add any whole #s from fraction to #
      12/9/2009
      7
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 1:
      3 2/3 + 5 1/6 =
      Answer is close to?
      9
      12/9/2009
      8
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 1:
      3 2/3 + 5 1/6 =
      2/3 + 1/6
      4/6 + 1/6 = 5/6
      3 + 5 = 8
      12/9/2009
      9
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 1:
      8 + 5/6 =
      8 5/6
      12/9/2009
      10
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 2:
      2 2/3 + 1 ½ =
      Answer is close to?
      4 or 5
      12/9/2009
      11
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 2:
      2 2/3 + 1 ½ =
      2/3 + ½ =
      4/6 + 3/6 = 7/6
      7/6 = 1 1/6
      12/9/2009
      12
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 2:
      2 + 1 = 3
      3 + 1 1/6 = 4 1/6
      12/9/2009
      13
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 3:
      4 ¼ - 1 2/3
      Answer be close to?
      2 or 3
      12/9/2009
      14
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 3:
      4 ¼ - 1 2/3
      Answer be close to?
      2 or 3
      12/9/2009
      15
      Bitsy Griffin Lessons 2-24 & 25
    • Renaming practice:
      8 ¼ =
      7 + 4/4 + ¼
      7 5/4
      12/9/2009
      16
      Bitsy Griffin Lessons 2-24 & 25
    • Renaming practice:
      6 2/3 =
      5 + 3/3 + 2/3
      5 5/3
      12/9/2009
      17
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 3:
      4 ¼ - 1 2/3
      ¼ - 2/3
      3/12 – 8/12
      Oops! What can we do?
      12/9/2009
      18
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 3:
      Rename the first mixed number to
      3 + 12/12 + 3/12
      3 15/12 – 1 8/12
      2 7/12
      12/9/2009
      19
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 3:
      Rename the first mixed number to
      3 + 12/12 + 3/12
      3 15/12 – 1 8/12
      2 7/12
      12/9/2009
      20
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 4:
      4 ¼ - 2 1/3
      3/12 – 4/12
      ???
      3 12/12 + 3/12 =
      3 15/12
      12/9/2009
      21
      Bitsy Griffin Lessons 2-24 & 25
    • Problem 4:
      3 15/12 - 2 4/12
      1 11/12
      12/9/2009
      22
      Bitsy Griffin Lessons 2-24 & 25
    • EQ:
      How do I add or subtract mixed numbers?
      12/9/2009
      23
      Bitsy Griffin Lessons 2-24 & 25