Steps
What is the first step when adding and subtracting fractions with unlike denominators?
Find a common denominator
2 1
____ + ____ =
3 4
11
___
12
1 1
____ - ___ =
3 4
1
___
12
3 2
2 ____ + ___ =
4 3
41
____
12
or 2 17/12 or 3 5/12
What is a denominator?
The number below the line in a fraction.
What is the second step when adding and subtracting fractions with unlike denominators?
Create equivalent fractions with a common denominator.
3 2
____ + ___ =
4 3
17
___
12
2 1
____ - ___ =
3 5
7
____
15
1 5
2 ____ + ___ =
4 6
74
______
24
or 2 26/24 or 3 2/24
What is a numerator?
The number above the line in a fraction.
What is the third step when adding and subtracting fractions with unlike denominators?
Add or subtract fractions with common denominators.
4 3
____ + ___ =
5 4
31
____
20
1 1
____ - ___ =
2 5
3
___
10
1 4
3 ____ + ___ =
4 5
81
____
20
or 3 21/20 or 4 1/20
What does equivalent mean?
Equal in value or the same in value.
How do you convert a mixed number into a fraction greater than 1?
Multiply the denominator by the whole number then add the numerator.
6 5
____ + ___ =
7 6
71
_____
42
4 2
____ - ___ =
5 3
2
___
15
4 1
3 ____ - ___ =
5 6
3 19/30
What does simplify mean?
To reduce a fraction to it's simplest form.
To convert fraction greater than 1 into a mixed number
How do you borrow when subtracting mixed numbers when the first fraction is smaller than the second?
You take one whole fraction from the whole number and add to the fraction part.
Ex: 7 1/3 would become 6 4/3
5 7
____ + ___ =
7 8
89
_____
56
5 1
____ - ___ =
7 3
8
___
21
2 2
4 ____ - 3 ___ =
3 6
1 6/18
What is a common denominator?
When your denominators are the same value.