You need a common denominator in order to add or subtract fractions.
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it stay the same when you subtract fractions and when you add fractions.
The denominators must be the same before you can add or subtract fractions.
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
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 .
Because to add fractions, the denominators must be equal.