1. Subtracting unlike fraction

2. Subtracting fraction
Fractions with the same denominator
II. The Butterfly Shortcut for subtracting unlike fractions

3. 7 - 3 = 4 5 - 2 = 7 = 1 Subtracting with Common Denominators Ex 1:
 4
Ex 1: =
= 1 4
1) SUBTRACT THE TOPS
2) KEEP THE BOTTOM
3) ALWAYS REDUCE IF POSSIBLE
5 - 2
Ex 2: = 7
1) SUBTRACT THE TOPS
2) KEEP THE BOTTOM
3) ALWAYS REDUCE IF POSSIBLE

4. Subtracting Fractions
The
‘Butterfly’ Method

5. Fractions: The Butterfly Methodx =
Bottoms:
Fractions: The Butterfly Method
Example 1 -
Step 1:
bottom x bottom = new bottom

6. - 23 35 12 - = 23 = Step 2: Find the Top Number second: first:
I. Cross-Multiply:
(start with top left)
Write this number on the left
II. Cross-Multiply:
(start with top right)
Write this number on the right
second:
2 x 6 = 12
first:
7 x 5 = 35 - = 23
This is the new top number
III. Subtract
bring down the sign in the middle 35 12 -
= 23
You must check to see if the fraction is reduced

7. Fractions: The Butterfly Method
Example 2 x =
Bottoms: -
Step 1:
bottom x bottom = new bottom

8. - 2 12 10 - = 2 = Step 2: Find the Top Number second: first:
I. Cross-Multiply:
(start with top left)
Write this number on the left
II. Cross-Multiply:
(start with top right)
Write this number on the right
second:
5 x 2 = 10
first:
4 x 3 = 12 - = 2
This is the new top number
III. Subtract
bring down the sign in the middle 12 10 -
= 2
You must check to see if the fraction is reduced

9. Try these
Subtract the following 1. 2. 3.