For Sports Day at her Bishan primary school, Aishah bakes a chiffon cake using 2 1/4 cups of flour and Devi bakes a butter cake using 1 5/6 cups of flour. What is the total number of cups of flour the two girls used? Express your answer as a mixed number in its simplest form.
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Worked Solution
Step 1: Find the LCD of the fraction parts 1/4 and 5/6.
LCM of 4 and 6 = 12, so LCD = 12.
Step 2: Convert each fraction part to twelfths.
1/4 = 3/12; 5/6 = 10/12.
Step 3: Add the fraction parts.
3/12 + 10/12 = 13/12 = 1 1/12 (since 13/12 is improper).
Step 4: Add the whole-number parts.
2 + 1 = 3.
Step 5: Combine the whole-number total with the fraction-part total.
3 + 1 1/12 = 4 1/12.
Final answer: 4 1/12 cups of flour in total.
Answer: 4 1/12
Correct answer: 4 1/12
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