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Ok so say you have a problem like 3/6 -7/5. You need a common denomonator, in this case 30. you get this by multiplying the first fraction by 5/5 which makes the 'new' fraction 15/30. You then multiply the next fraction by 6/6 to get 42/30.
you then subtract the numeraters and the denominator is unchanged. the answer would be -27/30 (15-42=-27)
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How are adding and subtracting fractions similar?
Subtracting a fraction is the same as adding its negative.
What are the rules for adding fractions?
Ensure that the denominators are the same when adding or subtracting fractions.
How are adding fractions different?
When adding or subtracting fractions their denominators must be the same
Before adding or subtracting two fractions they are converted into like fractions Explain with examples why this is necessary?
Before adding or subtracting two fractions they are converted into like fractions. Explain with examples why this is necessary.
Before adding or subtracting Why are fractions turned into like fractions?
They have to have the same denominator.
