Siti had 4/5 m of ribbon. She used 1/3 m of it to wrap a gift. How many metres of ribbon did she have left? Express your answer as a fraction in its simplest form.
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Worked Solution
Step 1: Find the Lowest Common Denominator (LCD) of 5 and 3.
Multiples of 5: 5, 10, 15, 20 ...
Multiples of 3: 3, 6, 9, 12, 15 ...
LCD = 15
Step 2: Convert 4/5 to a fraction with denominator 15.
15 ÷ 5 = 3, so multiply numerator by 3: 4 × 3 = 12
4/5 = 12/15
Step 3: Convert 1/3 to a fraction with denominator 15.
15 ÷ 3 = 5, so multiply numerator by 5: 1 × 5 = 5
1/3 = 5/15
Step 4: Subtract the fractions.
12/15 − 5/15 = 7/15
Siti had 7/15 m of ribbon left.
Correct answer: 7/15
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