Four bakers each used a fraction of their bag of flour to bake bread on Monday. Pat used 712 of her bag, Lim used 916 of his bag, Omar used 59 of his bag and Siti used 1120 of her bag. Which baker used the greatest fraction of their bag of flour?
- Pat
- Lim
- Omar
- Siti
Need a hint?
Use one common denominator for 12, 16, 9 and 20, then compare the numerators.
Worked answer
- Find a common denominator for 12, 16, 9 and 20: 720.
- Write each fraction with denominator 720: 712 = 420720, 916 = 405720, 59 = 400720, 1120 = 396720.
- Compare the numerators: 420 is the greatest, so 712 is the greatest fraction.
- Pat used the greatest fraction of her bag.
Answer: Pat
The mistake this question tests
Habit
Calculation slip
Choosing the fraction with the largest numerator (Siti) or the smallest denominator (Omar) without comparing the actual sizes.
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See the answer →Practise PSLE fractions until the mistakes stop.
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