M3.4.1 For the adult
Ratio: comparing parts
Ravi says there are 3 goats for every 2 sheep. I count 6 goats and 4 sheep. Who is right?
What this chapter teaches
A ratio compares two amounts in order. Equal ratios come from multiplying or dividing both numbers by the same number. To simplify, divide by the highest common factor, after the units match.
Three questions to ask
There is no one right wording. Listen for the idea.
- What does the ratio 6 : 4 say about the goats and the sheep?
- How do you know that 3 : 2 and 6 : 4 are the same mix?
- Why must you change 2 m to centimetres before you compare it with 50 cm?
After the chapter, the learner can
- Write the ratio of 6 goats to 4 sheep as 6 : 4
- Simplify a ratio like 6 : 4 to 3 : 2
What they copy into their notebook
A ratio compares two amounts in order. 6 : 4 is equal to 3 : 2. Divide both numbers by their highest common factor to simplify. Make the units match first.