NCERT Solutions Class 4 Maths Chapter 6 Measuring Length

NCERT Solutions for Class 4 Maths Chapter 6 Measuring Length help students understand how to measure and compare lengths using standard units. The chapter covers metre, centimetre, estimation, measurement, unit conversion, broken scales, and perimeter through practical activities and questions.

These Measuring Length Class 4 Maths question answers explain the concepts in simple language and show how to solve measurement-based problems step by step. Students can explore more Class 4 maths concepts, measurement topics, and age-appropriate learning resources on Curious Jr.

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Measuring Length Class 4 Maths Question Answer

Class 4 Maths Chapter 6 focuses on measuring length in everyday situations. Students learn to estimate a measurement, check it using a suitable tool, compare lengths, convert between metres and centimetres, and find the length around a shape.

Measuring Classroom Objects

Students first identify what can be measured using length. Length can describe how long, tall, wide or deep something is.

For example:

• The height of a student can be measured.

• The breadth of a blackboard can be measured.

• The height of a door can be measured.

• Weight and temperature are measured using different units.

A measuring tape, metre rope or scale can be used depending on the size of the object.

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Measuring Length Using Metres

A metre is useful for measuring objects and distances that are larger than the small objects normally measured with a centimetre scale.

Students can make and compare lengths of 1 metre, 5 metres and 10 metres using metre ropes. This helps them develop an idea of how long these distances actually are.

Important relationship:

1 metre = 100 centimetres

So:

• 2 m = 200 cm

• 4 m = 400 cm

• 6 m = 600 cm

• 8 m = 800 cm

Estimating and Measuring Length

Before measuring an object, students can first estimate its length and then check the estimate using a scale or measuring tape.

For example, a student may estimate the length of a classroom before measuring it. The actual measurement can then be compared with the estimate.

The purpose is not to make the estimate exact but to develop a better sense of length.

Guess the Length

The chapter also uses familiar objects and animals to help students understand large measurements.

For example, the chapter compares the approximate lengths of a bus, cricket bat, blue whale and crocodile. If a blue whale is about 30 metres long and a bus is about 15 metres long:

Length of two blue whales = 30 + 30 = 60 m

Number of buses = 60 ÷ 15 = 4

Therefore, about 4 buses would equal the length of two blue whales.

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Measuring Small Objects in Centimetres

Centimetres are useful for measuring smaller objects.

Examples include:

• Length of a textbook

• Length of a hand

• Small toys

• Small stationery items

• Other objects that fit comfortably beside a centimetre scale

Students are also encouraged to estimate an object's length before checking it with a scale.

Class 4 Maths Chapter 6 Measuring Length Solutions

Measuring with a Broken Scale

A broken scale may not begin at the 0 cm mark. In such cases, the length of an object is found by subtracting the starting reading from the ending reading.

Formula:

Length = Ending reading − Starting reading

For example, if an object starts at 8 cm and ends at 14 cm:

Length = 14 − 8 = 6 cm

So, the object is 6 cm long.

This is an important application of measurement in Chapter 6.

Finding a Route Length

The chapter includes a treasure-hunt activity where students compare different routes and calculate their lengths using centimetres.

The important method is:

1. Identify each part of the route.

2. Measure each part using the given scale.

3. Add the lengths.

4. Compare the totals to identify the shortest and longest route.

The exact answer depends on the route shown in the textbook diagram.

Converting Metres to Centimetres

To convert metres into centimetres, multiply by 100.

1 m = 100 cm

Therefore:

3 m = 3 × 100 = 300 cm

5 m = 5 × 100 = 500 cm

Similarly, to convert centimetres into metres, divide by 100.

200 cm = 200 ÷ 100 = 2 m

Measuring a Board with Stickers

Suppose a board is 2 metres long and each decorative sticker is 20 cm long.

First convert metres into centimetres:

2 m = 200 cm

Now divide:

200 ÷ 20 = 10

Therefore, 10 stickers are needed to cover the board completely.

Measuring Length Class 4 Notes

The main concepts to remember from Chapter 6 are:

The chapter also uses practical activities such as measuring classroom objects, comparing lengths, estimating measurements and working with boundaries of shapes.

Perimeter in Class 4 Maths Chapter 6

Chapter 6 also introduces students to measuring the boundary of shapes.

Perimeter means the total length around a closed shape.

To find the perimeter, add the lengths of all the sides.

For example, if the four sides of a shape are 5 cm, 4 cm, 5 cm and 4 cm:

Perimeter = 5 + 4 + 5 + 4 = 18 cm

Students also work with shapes on dot grids and compare boundaries to identify longer, shorter or equal perimeters.

Measuring Length Class 4: Important Conversions

Remember these basic conversions:

• 1 m = 100 cm

• 2 m = 200 cm

• 3 m = 300 cm

• 4 m = 400 cm

• 5 m = 500 cm

• 1 cm = 10 mm

When solving a question, measurements should be converted into the same unit before adding or comparing them.

Class 4 Maths Chapter 6 Extra Questions

1. Convert 7 metres into centimetres.

Solution:

1 m = 100 cm

7 m = 7 × 100

Answer: 700 cm

2. Convert 500 cm into metres.

Solution:

100 cm = 1 m

500 cm = 500 ÷ 100

Answer: 5 m

3. A ribbon is 3 m long. How many centimetres long is it?

Solution:

3 m = 3 × 100 cm

Answer: 300 cm

4. An object starts at 5 cm on a broken scale and ends at 17 cm. Find its length.

Solution:

Length = 17 − 5

Answer: 12 cm

5. What is the perimeter of a rectangle with sides 6 cm and 4 cm?

Solution:

Perimeter = 6 + 4 + 6 + 4

Answer: 20 cm

Quick Revision of Measuring Length Class 4

• Length tells us how long, tall, wide or deep something is.

• A centimetre is useful for measuring smaller objects.

• A metre is useful for larger lengths.

• 1 metre = 100 centimetres.

• Estimate a length before measuring it.

• Use a suitable scale, metre rope or measuring tape.

• For a broken scale, subtract the starting reading from the ending reading.

• Convert measurements to the same unit before comparing or adding them.

• Perimeter is the total length around a closed shape.