Everyday Math Grade 4 – Lesson 7.4 Adding and Subtracting Fractions Copyright © 2012 Kelly Mott.

Everyday MathGrade 4 – Lesson 7.4

Adding and Subtracting Fractions

Copyright © 2012 Kelly Mott

ADDING LIKE FRACTIONS


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

+ =


Practice 1:

4 1 6 6

2 1 3 3

+ = + =


Practice 2:

2 5 10 10

3 4 8 8

+ = + =


Practice 3:

2 5 9 9

2 3 5 5

+ = + =


SUBTRACTING LIKE FRACTIONS


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

- =


Practice 1:

9 2 9 9

5 3 6 6

= =- -


Practice 2:

4 2 5 5

3 1 3 3

= =- -


Practice 3:

4 2 4 4

7 5 8 8

= =- -


WORD PROBLEMS


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:


2. Ellen made tuna, egg, and ham sandwiches. If 5/8 are tuna sandwiches, and 2/8 are egg, how many are ham sandwiches?

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3. There are 18 players to make 3 equal teams. How many people will be on each team?

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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?

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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?

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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?

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ADDING UNLIKE FRACTIONS


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

+ =


Practice 1:

4 3 10 5

d+ =


Practice 2:

5 1 9 3

d+ =


Practice 3:

1 3 8 4

d+ =


Practice 4:

3 2 6 12

d+ =


Practice 5:

5 2 12 4

d+ =


Practice 6:

3 2 5 10

d+ =


Practice 7:

2 3 4 8

d+ =


Practice 8:

5 1 15 5

d+ =


Practice 9:

1 2 3 6

d+ =


Practice 10:

6 1 15 5

d+ =


Practice 1:

2 3 3 5

d+ =


Practice 2:

1 3 2 7

d+ =


Practice 3:

1 2 3 4

d+ =


Practice 4:

3 1 8 3

d+ =


Practice 5:

4 1 8 5

d+ =


Practice 6:

4 1 9 2

d+ =


1. Sandy walked ½ mile to the pet store and 4/10 mile to the crafts store. How far did she walk?

Question: Steps:



SUBTRACTING UNLIKE FRACTIONS


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

- =


Practice 1:

2 3 3 6

d- =


Practice 2:

3 3 4 8

d- =


Practice 3:

7 2 8 4

d- =


Practice 4:

11 1 12 6

d- =


Practice 5:

5 2 6 3

d- =


Practice 6:

3 3 4 12

d- =


Practice 7:

6 1

10 2

d- =


Practice 8:

1 1 2 6

d- =


Practice 9:

2 4 3 9

d- =


Practice 10:

8 3 10 5

d- =


Practice 1:

2 3 3 5

d- =


Practice 2:

1 3 2 7

d- =


Practice 3:

2 1 4 3

d- =


Practice 4:

5 1 8 3

d- =


Practice 5:

4 1 8 5

d- =


Practice 6:

7 1 9 2

d- =


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:



Everyday Math Grade 4 – Lesson 7.4 Adding and Subtracting Fractions Copyright © 2012 Kelly Mott.

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