Chapter 6 of Class 5 Maths Mela, The Dairy Farm, uses milk packets and butter pouches to explore multiplication shortcuts — doubling, halving, and multiplying by 10, 100, and 1000.
Key Concepts
Doubling and halving: quick mental-math shortcuts — double a number by adding it to itself; halve it by splitting it into two equal parts.
Multiplying by 10, 100, 1000: add one, two, or three zeros to the end of the number.
Farm word problems: scaling a daily quantity (like litres of milk) up to a week or month using multiplication.
Quick Recap
- Double 36 = 72. Halve 84 = 42.
- 45 × 100 = 4,500 (add two zeros).
Common Mistake to Avoid
Forgetting to add the correct number of zeros — ×10 adds one zero, ×100 adds two, ×1000 adds three; miscounting these is the most common slip.
Frequently Asked Questions
Why practise doubling and halving out loud?
It builds a fast mental-math habit that speeds up multiplication and division later, without needing pen and paper for small numbers.
How many 1-litre packets come from 250 litres of milk?
250 packets — each litre becomes exactly one 1-litre packet.
Full walkthrough: Chapter 6 Solutions · Extra Questions.
