Does that weight make sense?

In your book, Maths Mela (Chapter 8, Weight and Capacity), Anu writes down the weights of some things in her house. Some of her records make sense, and some cannot be right. Our job is to check them.

We weigh light things in grams (g) and heavy things in kilograms (kg). 1 kg is 1,000 g, so a kilogram is much heavier than a gram. Anu's water bottle weighs 650 g and her rice bag weighs 5 kg. Both of these make sense: a bottle of water is light enough to carry in one hand, and a bag of rice is heavier.

Now look at three of her other records: iron almirah 40 g, sofa 30 g, refrigerator 50 g. Each of these is less than her 650 g water bottle! An iron almirah, a sofa and a refrigerator are big, heavy things that we cannot lift easily. They must weigh many kilograms, not a few grams. So Anu has made a mistake in these three.

Whenever you read a weight, ask yourself: is this thing light or heavy? Does the unit, g or kg, fit it? Compare it with something you know, like a water bottle or a bag of rice.