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					 Comparing Fractions
at Pesky’s Partial Pizza
        Parlor
DoDEA 5th Grade Standard:
M1a2: Identify and generate equivalent
  forms of fractions.
GOALS: The student will be able to
  compare fractions to determine which is
  greater. The student will be able to
  identify equivalent fractions and find
  common denominators.
                  Created by C. Indresano 7/11/200
   Mom has invited all of your friends over for a
Pizza Party tonight!
  She wants you to go and pick up the pizza from
Pesky’s Partial Pizza Parlor downtown.
    You will need to get several kinds: Pepperoni,
Sausage, Mushroom, Cheese, Veggie, and
Supreme. The only problem is that Pesky is known
for cheating his customers. You’ll have to know
your fractions, if you want to get the best deal for
your money!
 Below are three rules that will help you! Click on
the buttons to learn more.
                                       After learning the rules,
                                       Go to Pesky’s Partial Pizza
       1         2        3            Parlor
Now that you have
  learned these tricks, do
  you think you can beat
  Pesky at his own
  game?
Pesky sells only parts of
  pizzas, not whole ones!
  He figures that if his
  customers don’t know
  their fractions, he can
  make lots of money!
  For each pizza you order, Pesky will offer you two
 choices. These choices both cost the same, $1.00. You
                 have $6.00 to spend.
Your job is to decide which choice will give you the MOST
  pizza. Keep track of how much pizza you’re getting.
If you forget any of the rules, click on the blue buttons to
                       remind you!


                       GOOD LUCK!
                    Rule # 1
IF both DENOMINATORS
   are the same,
look for the fraction with                         >
   the LARGEST
   numerator, it is greater
                                     3/6                   4/6
                       numerator                          The fraction
                                    denominator             with the
                                                             larger
                                                          numerator is
                                                            greater
                                   Click to go back
                                   to last slide viewed
                 Rule #2

IF the NUMERATORS are
   the same,                                     <
look for the SMALLEST
   denominator, it is           3/6                     3/5
   greater.
                  numerator        denominator         The fraction
                                                     with the smaller
                                                      denominator is
                                                         greater



                              Click to go back
                              to last slide viewed
                    Rule #3
IF there are no COMMON
numerators or
  denominators,
                                        >
Find a common
  denominator,               4/7                1/5
then compare the A common denominator of 5 and 7 is 35.
  fractions        4/7 x 5/5 = 20/35 and 1/5 x 7/7 =
                   7/35
using Rule #1       Another way to show this is 20/35 >
                      7/35
                                               Click to go
                                               back to last
                                               slide viewed
Pepperoni

Do you want    1/2 > 1/3

 1/2 or 1/3?   1/2 = 1/3


               1/2 < 1/3
Sausage
               1/4 > 2/4
Do you want
 1/4 or 2/4?   1/4 = 2/4

               1/4 < 2/4
Mushroom

Do you want    6/8 > 3/4
 6/8 or 3/4?
               6/8 = 3/4


               6/8 < 3/4
Cheese

Do you want      4/6 > 3/9
  4/6 or 3/9 ?
                 4/6 = 3/9


                 4/6 < 3/9
 Veggie
Do you want       4/11 > 4/10

 4/11 or 4/10 ?
                   4/11 = 4/10


                   4/11 < 4/10
Supreme
   Do you want
                 1/9 > 3/5
  1/9 or 3/5 ?
                 1/9 = 3/5

                 1/9 < 3/5
                 CORRECT!
You beat Pesky!
1/2 is greater than 1/3.
Look at the picture
This follows Rule #2                  >
                                1/2       1/3


                   Click here to
                   place your next
                   order
                YOU GOT IT!
Too bad for Pesky!
1/4 is less than 2/4.
Look at the picture                    <
This follows Rule #1
                                 1/4       2/4


                   Click here to
                   place your next
                   order
                       SORRY!
Pesky got you!
1/2 is greater than 1/3.
Look at the picture                          >
This follows Rule #2
                                      1/2        1/3


                       Click here to place
                       your next order
              YOU MISSED IT!
Shame on Pesky!
1/4 is less than 2/4.
Look at the picture               <
This follows Rule #1
                         1/4              2/4


                        Click here to
                        place your next
                        order
                 YOU GOT IT!
And since you knew they
  were both the same size,
  you get both parts for
  $1.00!                                       =
6/8 is equal to 3/4.
Look at the picture
                                   6/8              3/4
This follows Rule #3
                                         Using Rule #3
                                         3/4 x 2/2 =6/8

                             Click here to
                             place your next
                             order
                GOOD TRY but …
These are equivalent fractions.
6/8 is equal to 3/4.
Look at the picture
                                                 =
This follows Rule #3
The good news is that you
                                       6/8               3/4
get the same size of pizza no matter          Find a common denominator

   what you picked!!                                 3/4 x 2/2 =6/8


                                       Click here to
                                       place your next
                                       order
                INCORRECT!
Pesky stumped you!
4/6 is greater than 3/9.                      >
Look at the picture
This follows Rule #3              4/6                   3/9
                           4/6 x 3/3 =12/18       3/9 x 2/2 = 6/18


                                Click here to
                                place your next
                                order
                  GOOD JOB!
You stomped Pesky!
4/6 is greater than 3/9.
Look at the picture                  >
This follows Rule #3

                           4/6               3/9

                           Click here to
                           place your next
                           order
                  WAY TO GO!
Pesky can’t fool you!
4/11 is greater than 4/10.
Look at the picture
                                        <
This follows Rule #2

                             4/11              4/10

                             Click here to
                             place your next
                             order
                     NO LUCK!
Pesky fooled you!
4/11 is less than 4/10.
Look at the picture
                                            <
This follows Rule #2

                               4/11             4/10

                          Click here to
                          place your next
                          order
                   YAHOO!
You really got Pesky this
   time!
1/9 is less than 3/5.
Look at the picture
                                      <
This follows Rule #3
                            1/9              3/5

                             Let’s see how
                               you did?
                    OH NO!
Pesky really got you this
   time!
1/9 is less than 3/5.                          <
Look at the picture
This follows Rule #3             1/9                     3/5
                                 Find a common denominator
                            1/9 x 5/5 = 5/45   and 3/5 x 9/9 = 27/45



                                     Let’s see how
                                       you did?
How much Pizza did you get for
          $6.00?
If you beat Pesky every time you
   should have gotten:
Pepperoni: 1/2
Sausage: 2/4
Mushroom: 6/8 and 3/4 (bonus!)
Cheese:      4/6
Veggie:      4/10
Supreme: 3/5
                    Excellent work

     Click home
       to play
        again
                 Now you’re ready to go
                 home with your pizza!
                 Have a great time at the
                 party!
                             Sorry Pesky,
                             You’re not invited!
     For more fun comparing fractions,
            visit these websites
http://www.visualfractions.com/Compare.html
    http://www.webmath.com/k8cf.html

				
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