Find the value of 56 − 38.
Need a hint?
You cannot subtract fractions with different denominators. Find a common denominator first. What is the smallest number that both 6 and 8 can divide into?
Worked answer
- Find a common denominator for 6 and 8. The lowest common multiple is 24.
- Convert 56 to an equivalent fraction: 56 = 2024.
- Convert 38 to an equivalent fraction: 38 = 924.
- Subtract the numerators: 20 − 9 = 11.
- The answer is 1124.
Answer: 11/24
The mistake this question tests
Habit
Calculation slip
A common mistake is to subtract the numerators and the denominators separately. Both fractions must first be changed to twenty-fourths: 2024 − 924.
How to fix it at home →Wrong answers children often give:
- 11/48 Calculation slip
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See the answer →Practise PSLE fractions until the mistakes stop.
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