At Family Sports Day, 12 children joined the obstacle-course event and 18 children joined the relay event. What is the ratio of the number of children who joined the obstacle-course event to the number of children who joined the relay event?
- 2 : 3
- 3 : 2
- 1 : 3
- 2 : 5
Need a hint?
Find the greatest common factor of the two quantities and divide both terms by it.
Worked answer
- Write the ratio in the order asked: 12 : 18.
- Divide both terms by their greatest common factor, 6: 12 : 18 = 2 : 3.
Answer: 2 : 3 ratio
The mistake this question tests
Habit
Stopped at one part in ratio
Some pupils write the numbers in the wrong order, 18 : 12 = 3 : 2. The obstacle-course number must come first.
How to fix it at home →Wrong answers children often give:
- 3 : 2 Stopped at one part in ratio
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See the answer →Practise PSLE ratio until the mistakes stop.
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