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When adding or subtracting fractions where the denominators are different. Convert the fractions to a common denominator.
Sometimes it is possible to operate on the integers separately to the fraction part but it is good practice to convert mixed numbers into improper fractions.
3²/₅ - 1¼ = 17/5 - 5/4 The common denominator of 5 and 4 is 20.
(4 x 17) - (5 x 5) ÷ 20 = (68 - 25) ÷ 20 = 43/20
This can be converted to the mixed number 2 and 3/20
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What is nine tenths plus two fifths minus one fourth?
Nine tenths plus two fifths minus one fourth is equal to 1.05
What is one fourth minus two fifths minus three thenths?
1/4 minus 2/5 minus 3/10 is equal to -0.45 or -9/20
What does 4 and one fifth minus two and three fifths equal?
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
What is nine and one fifths minus two and three fifths?
six and three fifths
What is 3 sevenths minus 2 fifths?
We convert it into thirty-fifths. That gives 15 thirty-fifths minus 14 thirty-fifths which is one thirty fifth.
