Quintals and tonnes

In your book, Maths Mela (Chapter 8), we meet units for very heavy things. The whole wheat harvest of a farm, or a loaded truck, weighs thousands of kilograms, so we often use bigger units for them.

100 kg = 1 quintal. 10 quintals = 1 tonne. Since 10 quintals are 10 × 100 kg = 1,000 kg, we can also say 1,000 kg = 1 tonne.

So 5,000 kg is 50 quintals, because 50 × 100 kg = 5,000 kg. It is also 5 tonnes, because 5 × 1,000 kg = 5,000 kg. In the same way, 9,000 kg = 90 quintals, and 8 tonnes = 8,000 kg.

The book puts all our weight units in order 'From Tiny to Big': 1,000 mg = 1 g, 1,000 g = 1 kg, 100 kg = 1 quintal, and 10 quintals = 1 tonne. From the lightest unit to the heaviest: milligram, gram, kilogram, quintal, tonne.