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To add/subtract fractions you need to bring both to a common denominator, then add/subtract the numerators(top) .
e.g.
3 2/3 - 2 1/5
Convert to improper fractions.
11/3 - 11/5
Brinf to a common denomiator
[11(5) - 11(3)] / (3 x 5)
[55 - 33] / 15
[22] / 15 =
1 7/15
For addition , it is the same process , but add the numerators ( 55+ 33 = 88]
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How do you add and subtract fractions with the same denominator?
it stay the same when you subtract fractions and when you add fractions.
When do you need a common denominator?
The denominators must be the same before you can add or subtract fractions.
Do you need a common denominator for all fractions before doing the order of operations?
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
Is it important to know how to add and subtract fractions why?
it is important to learn how to add and subtract fractions because we can use it when a time comes , when we have our own business and others .
When you add or subtract fractions with unlike denominators why do you have to find LCM?
Because to add fractions, the denominators must be equal.
