NCERT Class 5 Mathematics Math-Magic: Chapter 10 — centimetres.
Chapter 3 of NCERT's Class 5 Mathematics, 'How Many Times?', delves into the concepts of measurement, specifically focusing on centimeters and millimeters. It introduces the relationship between centimeters and millimeters, explaining that 1 centimeter is equal to 10 millimeters. The chapter uses practical examples like measuring pencils and nails to illustrate these units. It also touches upon decimal representation of lengths, such as 0.1 cm for one millimeter. The text introduces different types of frogs, comparing their lengths in centimeters and millimeters, and poses questions that encourage estimation and calculation involving these units. Students are prompted to compare lengths and understand scale, preparing them for more complex measurement and comparison tasks in mathematics.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 5 |
| Subject | Mathematics |
| Book | Math-Magic |
| Chapter | Chapter 10 — centimetres. |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 388 |
Learning outcomes
- Understand the relationship between centimeters and millimeters.
- Measure lengths using centimeters and millimeters.
- Convert between centimeters and millimeters.
- Relate decimal notation to fractions of a centimeter.
- Estimate and compare lengths using metric units.
Vocabulary
| Word | Meaning |
|---|---|
| centimetre | A unit of length in the metric system, equal to one hundredth of a meter. |
| millimetre | A unit of length in the metric system, equal to one thousandth of a meter; one tenth of a centimeter. |
| tenth | One of ten equal parts of a whole. |
| decimal | A number expressed using a decimal point. |
| scale | A series of marks or divisions on an instrument for measuring. |
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Practice questions
- How many millimeters are there in 1 centimeter? Answer: 10 millimeters
- What is the length of a pencil that is 3 centimeters and 6 millimeters long, in centimeters? Answer: 3.6 cm
- A Bull Frog is 30.5 cm long. How many centimeters and millimeters is this? Answer: 30 cm and 5 mm
- What is the length of the pencil shown in the image in millimeters? Answer: 40 mm
Frequently asked questions
What is the relationship between centimeters and millimeters?
1 centimeter is equal to 10 millimeters.
How is one-tenth of a centimeter written in decimal form?
One-tenth of a centimeter is written as 0.1 cm.
What is the length of the smallest frog mentioned in the chapter?
The smallest frog mentioned is 0.9 cm long.
What is the length of the biggest frog mentioned in the chapter?
The biggest frog mentioned is 30.5 cm long.
How can we express 3 centimeters and 6 millimeters in centimeters?
3 centimeters and 6 millimeters can be expressed as 3.6 cm.
What does 0.9 cm mean in terms of millimeters?
0.9 cm means 9 millimeters.
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NCERT Class 5 Mathematics — Math-Magic — Chapter 10 — centimetres.. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.