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

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?

Question: Steps:

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

Question: Steps:

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:

5. Mike walked 3/16 mile to one store and 4/16 mile to another store. How far did he walk altogether?

Question: Steps:

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:

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

Practice 2:

5 1 9 3

Practice 3:

1 3 8 4

Practice 4:

3 2 6 12

Practice 5:

5 2 12 4

Practice 6:

3 2 5 10

Practice 7:

2 3 4 8

Practice 8:

5 1 15 5

Practice 9:

1 2 3 6

Practice 10:

6 1 15 5

Practice 1:

2 3 3 5

Practice 2:

1 3 2 7

Practice 3:

1 2 3 4

Practice 4:

3 1 8 3

Practice 5:

4 1 8 5

Practice 6:

4 1 9 2

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

Practice 2:

3 3 4 8

Practice 3:

7 2 8 4

Practice 4:

11 1 12 6

Practice 5:

5 2 6 3

Practice 6:

3 3 4 12

Practice 7:

Practice 8:

1 1 2 6

Practice 9:

2 4 3 9

Practice 10:

8 3 10 5

Practice 1:

2 3 3 5

Practice 2:

1 3 2 7

Practice 3:

2 1 4 3

Practice 4:

5 1 8 3

Practice 5:

4 1 8 5

Practice 6:

7 1 9 2

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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