Table of Contents

**Table of Contents**

- Units of Length
- Units of Weight
- Units of Volume
- Summary
- Did You Know?
- What’s Next?

In our previous segment, we learnt about the **use of commas **while expressing large numbers. In this segment, we will learn how we can use numbers to measure things in our daily life.

We come across numbers when we measure something. For example, distances between places, the height of buildings and so on. And when we measure, we use certain units of measurement like centimetre and metre for length. Similarly, there are other units of measurement. Let us know more about these units and how they are used.

## What are the units of length?

We measure the dimensions of different objects in our daily lives. Based on the size of the objects, we represent their dimensions in different units of length.

For example,

To measure the thickness of the lead of our pencils, we use a millimetre scale (mm). To measure the dimensions of a mobile phone, we use the centimetre scale (cm). For measuring the dimensions of the kitchen area, we use a meter scale (m). And to measure the distance between two far off places, we use the kilometre scale (km).

This is how all these scales are related to each other:

1 cm = 10 mm

1 m = 100 cm

1 km = 1000 m

## What are the units of weight?

To measure how heavy an object is, we use weight. The weight of an object can be measured in various units. For example : gram (gm), kilogram (kg), etc.

For measuring light-weighted objects we use milligrams (mg). As the weight of the object increases, we use higher units of weight such as grams and kilograms (kg).