Math Rules Adding Fractions: You can only add …
Math Rules
Adding Fractions: You can only add fractions with common denominators.
Example: 1 + 2 = 3 (the denominator will always stay the same)
5
5
5
Adding Fractions: If the denominators are not the same, you must find the common denominator by finding the least common multiple (LCM).
Example: 3 + 1 = (the common denominator is 14 so in this case 3 must be
7 14
7
multiplied by 2 to have a common denominator) 6 + 1 = 7
2
14
14
14
Then, reduce the fraction: 7 = 1
14
2
Subtracting Fractions: You can only subtract fractions with common denominators.
Example:
8 9
-
4=
9
4 (the denominator will always stay the same)
9
Subtracting Fractions: If the denominators are not the same, you must find the common denominator by finding the least common multiple (LCM).
Example:
2 3
-
1 = (the least common multiple is 12 so that will be the common
4
denominator in this case.
You will have to multiply 2
3
?
4 4
1 4
?
3)
3
The equation is now:
8 12
-
3=
12
5 12
Multiplying Fractions: You can multiply both the numerators and denominators, whether they are common or not.
Example: 3 ? 1 = 3
5 4
20
Multiplying Fractions: If you can, you must reduce.
Example: 3 ? 4 = 12 = 6
10
5
50 25
Multiplying Fractions: Always remember to cross multiply, if it is possible and then reduce.
Example: 5 ? 28 = 5 ? 28 = 1 ? 4 = 2
7
30
7
30
1
6
3
Dividing with fractions: 1st Step--When dividing fractions, always flip the second fraction and then multiply.
Example: 4 ? 2 = 4 ? 3
6 3
6
2
2nd Step--Cross Multiply (see if there are common multiples).
Example: 4 ? 3 =
6
2
3rd Step--Then Multiply.
Example: 2
2
?
1 1
=
2 2
1
................
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