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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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