Lesson 4 of 15
Match the units, then cut it down
Show on a big screenA packet holds 500 g of rice. A bag holds 2 kg. What is the ratio?
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Step 1 of 3
- 500 g and 2 kg — different units.
- Convert: 2 kg = 2000 g.
- Now divide: 500 : 2000 = 1 : 4.
The rule
The ratio is 1 : 4.
Match the units first. For example, 1 kg is 1000 g. Then divide both parts by the highest number that divides both.
A ratio is in simplest form when only 1 divides both parts.
- 12 and 18 both divide by 6. 12 ÷ 6 = 2 and 18 ÷ 6 = 3. That gives 2 : 3.
- 90 and 150 both divide by 30. 90 ÷ 30 = 3 and 150 ÷ 30 = 5. That gives 3 : 5.
- 450 mL and 600 mL (millilitres) both divide by 150. That gives 3 : 4.
Try the lab to finish this lesson.