everyday math grade 4 – lesson 7.4 adding and subtracting fractions copyright © 2012 kelly mott
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Everyday MathGrade 4 – Lesson 7.4
Adding and Subtracting Fractions
Copyright © 2012 Kelly Mott
ADDING LIKE FRACTIONS
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Adding with Like Denominators• When you add fractions with like denominators, we
keep the same denominator, and just add the top numerator.
1 2 4 4
+ =
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Practice 1:
4 1 6 6
2 1 3 3
+ = + =
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Practice 2:
2 5 10 10
3 4 8 8
+ = + =
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Practice 3:
2 5 9 9
2 3 5 5
+ = + =
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SUBTRACTING LIKE FRACTIONS
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Subtracting with Like Denominators• When you subtract fractions with like
denominators, keep the bottom (denominator) the same and subtract the top (numerator).
5 2 6 6
- =
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Practice 1:
9 2 9 9
5 3 6 6
= =- -
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Practice 2:
4 2 5 5
3 1 3 3
= =- -
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Practice 3:
4 2 4 4
7 5 8 8
= =- -
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WORD PROBLEMS
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1. Marcel used 1/4 cup of sugar to make bread and 3/4 cup of sugar to make muffins. How much sugar did he use in all?
Question: Steps:
Solve: Answer in Words:
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2. Ellen made tuna, egg, and ham sandwiches. If 5/8 are tuna sandwiches, and 2/8 are egg, how many are ham sandwiches?
Question: Steps:
Solve: Answer in Words:
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3. There are 18 players to make 3 equal teams. How many people will be on each team?
Question: Steps:
Solve: Answer in Words:
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4. Mosi bought a notebook for $3.65, a pen for $1.37, and some paper for $2.81. How much did he spend?
Question: Steps:
Solve: Answer in Words:
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5. Mike walked 3/16 mile to one store and 4/16 mile to another store. How far did he walk altogether?
Question: Steps:
Solve: Answer in Words:
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6. Kim lives between Rick and Peter. She lives 3/8 mile from Rick and 2/8 mile from Peter. How far does Rick live from Peter?
Question: Steps:
Solve: Answer in Words:
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ADDING UNLIKE FRACTIONS
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Adding Unlike Fractions• When you add fractions with different denominators,
you have to make the denominators the same. • Look for the least common factor and multiply.
1 1 2 4
+ =
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Practice 1:
4 3 10 5
d+ =
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Practice 2:
5 1 9 3
d+ =
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Practice 3:
1 3 8 4
d+ =
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Practice 4:
3 2 6 12
d+ =
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Practice 5:
5 2 12 4
d+ =
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Practice 6:
3 2 5 10
d+ =
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Practice 7:
2 3 4 8
d+ =
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Practice 8:
5 1 15 5
d+ =
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Practice 9:
1 2 3 6
d+ =
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Practice 10:
6 1 15 5
d+ =
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Practice 1:
2 3 3 5
d+ =
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Practice 2:
1 3 2 7
d+ =
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Practice 3:
1 2 3 4
d+ =
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Practice 4:
3 1 8 3
d+ =
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Practice 5:
4 1 8 5
d+ =
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Practice 6:
4 1 9 2
d+ =
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1. Sandy walked ½ mile to the pet store and 4/10 mile to the crafts store. How far did she walk?
Question: Steps:
Solve: Answer in Words:
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SUBTRACTING UNLIKE FRACTIONS
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Subtracting Unlike Fractions• When you subtract fractions with different
denominators, you have to make the denominators the same.
• Look for the least common factor and multiply.
1 1 2 4
- =
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Practice 1:
2 3 3 6
d- =
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Practice 2:
3 3 4 8
d- =
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Practice 3:
7 2 8 4
d- =
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Practice 4:
11 1 12 6
d- =
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Practice 5:
5 2 6 3
d- =
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Practice 6:
3 3 4 12
d- =
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Practice 7:
6 1
10 2
d- =
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Practice 8:
1 1 2 6
d- =
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Practice 9:
2 4 3 9
d- =
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Practice 10:
8 3 10 5
d- =
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Practice 1:
2 3 3 5
d- =
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Practice 2:
1 3 2 7
d- =
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Practice 3:
2 1 4 3
d- =
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Practice 4:
5 1 8 3
d- =
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Practice 5:
4 1 8 5
d- =
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Practice 6:
7 1 9 2
d- =
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1. Flo swam ½ mile in the morning. She swam ¾ mile in the evening. How much farther did she swim in the evening?
Question: Steps:
Solve: Answer in Words:
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Copyright © 2012 Kelly Mott