Fraction Attraction

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Fraction Attraction

• Mathematics
• Grade 7

Teacher Information
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Teacher Information

• Content This lesson provides a review of
  fractions. It is meant to be used after the
  concepts of addition, subtraction,
  multiplication, and division of fractions have
  been taught.
• Grade Level 7
• Creator Abby Neiburger
• Curriculum Objective/MAP Standard IIB. Computes
  the sum, difference, product, or quotient of
  whole numbers, fractions, and decimals. MA-1
  3.2, 3.3, 4.1
• Students will need a pencil and paper for this
  presentation.

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Addition!

• The most important fact to remember about adding
  fractions is
• In order to add fractions, the denominators must
  be the same!

Common Denominators
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Pie, Pie, Me oh My!

• Rose has 1/4 of an apple pie, and her friend has
  2/4 of the same pie. Together, Rose and her
  friend have what fractional part of the apple
  pie?
• Together, they have ¾ of the pie!

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Checkers!

• Taylor had 3 whole checker sets and 2/3 of
  another. Then his uncle gave him 4 whole checker
  sets and 5/6 of another. How many checker sets
  does Taylor end up with?
• 32/3 45/6
• Taylor ends up with 81/2 checker sets!

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Subtraction!

• You also need common denominators to subtract
  fractions.
• Adding and subtracting fractions are very similar
  operations!
• When subtracting with mixed numbers, it is easier
  to change them to improper fractions.

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Fake blood everywhere!

• Jennifer bought 103/4 gallons of fake blood, to
  play some kind of terrible trick on her good
  friend Taylor. On her way to set up the trick
  she spilled 37/8 gallons of fake blood. How much
  blood did she have left?
• She had 67/8 gallons remaining. Gross!

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Multiplication!

• Many people think that multiplying fractions is
  the easiest operation. You dont need a common
  denominator, just multiply straight across.
• If you have mixed numbers in your problem,
  remember to change them to improper fractions
  before multiplying!

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Have you lost your marbles?

• Quincy has 6 bags of marbles. If he wants to
  give away 4/5 of them, how many bags will he give
  away?
• Hint Remember what the word of means in math!
• (Always remember to simplify your answers!)
• He will give away 44/5 bags of marbles! He
  really has lost his marbles now!

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Picnicking!

• Sam and Laurie have 31/2 cantaloupes. Jennifer
  is going on a picnic and she wants to take 1/5 of
  their cantaloupes with her. How many cantaloupes
  will she be able to take?
• She will take 7/10 of a cantaloupe!

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Division!

• Division is similar to multiplication, only you
  have to do one small step first. When you see
  the division sign, simply change it to
  multiplication and flip the second fraction
  upside down. This is called using the
  multiplicative inverse!
• If you have division with mixed numbers, dont
  forget to change them to improper fractions first!

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Slice that pizza up!

• Saucy Sammy has 7/8 of a pizza. How many skinny
  little 1/32 slices are there in his 7/8?
• There are 28 little slices! That could make your
  pizza really go around!

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Watch out for the bugs!

• Frita has a bug collection that consists of 53/5
  bags of bugs. How many ¼ bags does she have in
  her collection?
• She has 222/5 bags of bugs! What is she
  thinking?!

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Finale!

• AdditionRemember your common denominator!
• SubtractionRemember you common denominator!
• MultiplicationMultiply straight across!
• DivisionChange it to multiplication and flip the
  second fraction over!