Small weights, big weights

In your book, Maths Mela (Chapter 8), there are erasers that weigh 10 g each. How many erasers weigh the same as a 50 g packet of haldi? Count in tens: 10, 20, 30, 40, 50. That is 5 erasers. A 100 g soap bar weighs the same as 10 erasers, and 250 g of sugar weighs the same as 25 erasers.

Mr Shrinathan has a sweet shop. Four customers each order 1 kg of kaju-katli, but each wants it packed in a different size of box. Remember, 1 kg = 1000 g. Mr Das wants boxes of 500 g: 500 g + 500 g = 1000 g, so he gets 2 boxes. Mrs Fernandes wants boxes of 250 g: she gets 4 boxes.

Mrs Khan wants boxes of 100 g. Count in hundreds up to 1000: she gets 10 boxes. Mr Patel wants boxes of 50 g. Two 50 g boxes make 100 g, so he needs twice as many boxes as Mrs Khan: 20 boxes. The smaller the box, the more boxes are needed.

It works for kilograms too. A 10 kg sack of flour holds as much as 10 packets of 1 kg. 20 kg is 20 packets of 1 kg, 50 kg is 50 packets, and 25 kg is 25 packets.