A recipe requires 2 1/3 cups of flour. Priya has 1 3/4 cups of flour at home. How much more flour does Priya need to buy?
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Worked Solution
Step 1: Convert both mixed numbers to improper fractions.
2 1/3 = (2 × 3 + 1)/3 = 7/3
1 3/4 = (1 × 4 + 3)/4 = 7/4
Step 2: Find the lowest common denominator (LCD) of 3 and 4.
LCD = 12
Step 3: Convert both improper fractions to twelfths.
7/3 = (7 × 4)/(3 × 4) = 28/12
7/4 = (7 × 3)/(4 × 3) = 21/12
Step 4: Subtract.
28/12 − 21/12 = 7/12
Priya needs to buy 7/12 cup more flour.
Correct answer: 7/12
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