What is a Kilometre?

S0-SA5-0453

Grade Level:

Class 2

Physics, Geography, Computing (GPS), Transport

Definition

What is it?

A kilometre is a unit of measurement used to measure long distances. It tells us how far one place is from another. One kilometre is equal to 1000 metres.

Simple Example

Quick Example

Imagine you are walking from your home to your school. If your school is very far, we might say it is 1 kilometre away. This means you have to walk 1000 metres to reach your school.

Worked Example

Step-by-Step

PROBLEM: Your friend lives 2 kilometres away from your house. How many metres do you need to walk to reach your friend's house?

STEP 1: Understand what a kilometre is. We know 1 kilometre = 1000 metres.
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STEP 2: Identify the given distance. Your friend lives 2 kilometres away.
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STEP 3: To find the total metres, multiply the distance in kilometres by 1000.
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STEP 4: Calculation: 2 kilometres * 1000 metres/kilometre = 2000 metres.
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ANSWER: You need to walk 2000 metres to reach your friend's house.

Why It Matters

Kilometres are essential for understanding distances in daily life, from planning a road trip to knowing how far a train travels. Knowing about kilometres helps engineers design roads, pilots fly planes, and even helps delivery drivers find your home quickly.

Common Mistakes

MISTAKE: Confusing kilometres with metres directly, thinking they are the same unit. | CORRECTION: Remember that 1 kilometre is a much larger unit, equal to 1000 metres.

MISTAKE: Forgetting the conversion factor and using 100 or 10 instead of 1000 when converting kilometres to metres. | CORRECTION: Always remember the 'kilo' prefix means 1000. So, 1 kilometre = 1000 metres.

MISTAKE: Not specifying the unit when stating a distance (e.g., just saying '5' instead of '5 kilometres'). | CORRECTION: Always mention the unit (kilometres, metres) to make the measurement clear and correct.

Practice Questions

Try It Yourself

QUESTION: A bus travels 5 kilometres from the station to the market. How many metres did the bus travel? | ANSWER: 5000 metres

QUESTION: Your favourite cricketer hit a six that travelled 100 metres. Is this more or less than 1 kilometre? | ANSWER: Less than 1 kilometre (because 1 km = 1000 m, and 100 m is less than 1000 m)

QUESTION: The distance from Delhi to Agra is approximately 200 kilometres. If you travel half of this distance, how many metres have you covered? | ANSWER: 100,000 metres (Half of 200 km is 100 km. 100 km * 1000 m/km = 100,000 m)

MCQ

Quick Quiz

Which of the following is the correct relationship?

1 kilometre = 100 metres

1 metre = 1000 kilometres

1 kilometre = 1000 metres

1 metre = 10 kilometres

The Correct Answer Is:

Option C is correct because 'kilo' means 1000, so 1 kilometre is equal to 1000 metres. The other options show incorrect conversions between kilometres and metres.

Real World Connection

In the Real World

When you use Google Maps or Ola/Uber to find directions in India, the distances shown are usually in kilometres. For example, if you book an auto-rickshaw, the app will show you how many kilometres away your destination is and estimate the fare based on that distance.

Key Vocabulary

Key Terms

UNIT: A standard quantity used for measurement | DISTANCE: How far apart two points or places are | METRE: A basic unit of length | CONVERSION: Changing a measurement from one unit to another

What's Next

What to Learn Next

Now that you understand what a kilometre is, you can explore other units of length like the centimetre and millimetre. You'll learn how they relate to metres and kilometres, helping you measure even more accurately!