Foundation Mathematics Primary 6 Ratio

In an HDB block, the residents on three different floors are recorded in the ratio 12 : 18 : 30. Express this ratio in its simplest form.

A 1 : 2 : 5
B 2 : 3 : 5
C 4 : 6 : 10
D 6 : 9 : 15
Show Worked Solution

Worked Solution

Step 1: Find the greatest common factor (GCF) of 12, 18 and 30. Factors of 12: 1, 2, 3, 4, 6, 12. Factors of 18: 1, 2, 3, 6, 9, 18. Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30. GCF = 6. Step 2: Divide each term by the GCF. 12 ÷ 6 = 2 18 ÷ 6 = 3 30 ÷ 6 = 5 Step 3: Write the simplified three-term ratio. Ratio in simplest form = 2 : 3 : 5. Answer: 2 : 3 : 5

Correct answer: 2 : 3 : 5

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