Write the ratio 12 : 18 in its simplest form.
- 3 : 2
- 2 : 3
- 4 : 6
- 6 : 9
Worked answer
- The highest common factor of 12 and 18 is 6.
- 12 ÷ 6 = 2 and 18 ÷ 6 = 3, so 2 : 3.
Answer: 2 : 3
The mistake this question tests
Habit
Simplest form in final fraction answers
That ratio is equal, but not in its simplest form. Divide both by their highest common factor.
How to fix it at home →Wrong answers children often give:
- 4 : 6 Simplest form in final fraction answers
- 6 : 9 Simplest form in final fraction answers
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See the answer →Practise PSLE ratio until the mistakes stop.
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