Original notes — ready
Chapter 6: The Dairy Farm
CBSE (NCERT, English Medium) • Class 5 • Mathematics • Book: Math Mela
The Dairy Farm — EG's own notes, in simple words
Book: Math Mela (CBSE, Class 5) | Chapter 6 | Medium: English
Diagram (labels are printed on the image): A cow, a milk can and a bucket on a dairy farm. A general teaching picture about litres.
A farmer at work on a dairy farm. A general picture, not a chapter scene.
What the chapter is about
This chapter takes us to a dairy farm, where cows and buffaloes give milk. It is full of real-life maths: counting litres of milk, finding the cost of milk, and sharing work fairly.
Milk is measured in litres (L) and millilitres (mL): 1 litre = 1000 millilitres. If one cow gives 8 litres in a day, five cows give 5 × 8 = 40 litres.
Money maths appears too: if milk costs ₹40 per litre, then 5 litres cost 5 × 40 = ₹200. Multiplication and addition are the farmer's daily tools.
Farmers also keep daily records: how much milk each animal gives, how much is sold, and how much money comes in. These records help them plan — for example, whether the farm needs more feed, or whether one animal needs care.
What you should learn
Read the numbers in the chapter like a shopkeeper: how much, how many, at what rate? Then choose multiply or add.
Key Terms
- Litre (L) — 1000 millilitres; used for milk and liquids.
- Dairy farm — A farm where animals are kept for milk.
- Rate — Price of one unit, e.g. ₹40 per litre.
- Total — The whole amount after adding or multiplying.
- Cost — The money needed to buy something.
- Record — Written notes of numbers and facts, kept to remember and plan.
Remember
- 1 L = 1000 mL.
- Total milk = number of animals × milk per animal.
- Total cost = quantity × rate.
- Check units: litres with litres, rupees with rupees.
Exam Tip / Common Mistake
Common mistake: mixing litres and millilitres in one sum. Convert to one unit first — 2 L 500 mL = 2500 mL.
Chart / Table: Milk maths
| Item | Value |
|---|---|
| One cow per day | 8 litres |
| Five cows per day | 40 litres |
| Rate of milk | ₹40 per litre |
| Cost of 5 litres | ₹200 |
Think and try
One cow gives 8 litres a day. How much do 3 cows give in a day, and how much in 2 days? Work it out step by step: first one day, then two days. Check your answer by adding instead of multiplying.
Practice set — try it yourself
- One buffalo gives 6 litres a day. How much do 4 buffaloes give?
Hint: Multiply. - Milk costs ₹50 a litre. What is the cost of 3 litres?
Hint: Multiply quantity by rate. - Convert 2 litres 500 millilitres into millilitres.
Hint: 2 × 1000, then add 500. - A farm collects 60 litres and sells 45 litres. How much is left?
Hint: Subtract. - If 10 litres cost ₹500, what is the cost of 1 litre?
Hint: Divide.
How to use this page: Read the summary, say the Key Terms in your own words, then try the practice set without looking. Ask your teacher or parent to check your answers.