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Name ____________________________________              Date __________________
Mrs. Labuski / Mrs. Rooney Period __________           Lesson 5-7 Adding &
                                                       Subtracting Fractions with
                                                       Unlike Denominators

 1
 3
 1         Find a common denominator for 3 and 5.
+5

 1  5
 3 15
 1  3
           Write equivalent fractions with 15 as the
+5 15      denominator.
     8     Add the numerators.
     15
           Keep the denominator
Add or subtract. Write your answer in simplest form.
There are three grades in Kyle’s middle school—sixth, seventh,
and eighth. One-third of the students are in sixth grade and ¼ are
in seventh grade. What fraction of the school’s students are in
eighth grade?
_1
5
2_ of the students




Sarah is making a dessert that calls for cup of crushed cookies. If
she has already crushed    cup, how much more does she need?
_1
1
0_

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Lesson 5 7 add sub unlike den

  • 1. Name ____________________________________ Date __________________ Mrs. Labuski / Mrs. Rooney Period __________ Lesson 5-7 Adding & Subtracting Fractions with Unlike Denominators 1 3 1 Find a common denominator for 3 and 5. +5 1 5 3 15 1 3 Write equivalent fractions with 15 as the +5 15 denominator. 8 Add the numerators. 15 Keep the denominator Add or subtract. Write your answer in simplest form.
  • 2. There are three grades in Kyle’s middle school—sixth, seventh, and eighth. One-third of the students are in sixth grade and ¼ are in seventh grade. What fraction of the school’s students are in eighth grade? _1 5 2_ of the students Sarah is making a dessert that calls for cup of crushed cookies. If she has already crushed cup, how much more does she need? _1 1 0_