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Tamil Nadu (TNBSE)Class 1 Mathematics★ 4-6 marks in TN Class 1 Term 2 exam — comparison-based questions, measuring with handspan/footspan, and heavy/light sorting

Measurements

Samacheer Kalvi (TN State Board) Class 1 Mathematics — Chapter 4, Measurements. Length and Weight using non-standard units. Study notes, key concepts, worked examples, practice questions and quick revision for exam preparation.

⏱ 10 min readEasy difficulty✓ Free · NCERT-aligned

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By the end of this chapter you'll be able to…

1Compare lengths using words like long/short, tall/short, longer/shorter, longest/shortest
2Measure length using non-standard units — handspan, cubit (muzham), footspan, pace (step)
3Compare weights using words like heavy/light, heavier/lighter, heaviest/lightest
4Compare capacities — which container holds more water and which holds less
5Explain why we need standard units (because everyone's handspan is different!)

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Why this chapter matters

Measurement is a life skill every child uses daily — comparing who is taller, checking which bag is heavier, finding out how many steps to the door. This chapter introduces measurement without a ruler or weighing scale, using body parts like handspan and footspan. It teaches children that maths is not just about numbers on paper — it is about understanding the physical world around them.

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Measurements — Class 1 Mathematics (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 1 Mathematics, Chapter 4. Length and Weight using non-standard units.

1. About this chapter

This chapter covers Measurements as part of the Class 1 Samacheer Kalvi Mathematics curriculum. It deals with length and weight using non-standard units and builds conceptual understanding essential for the TN School Term Exam.

By the end of this chapter, students will be able to:

Compare lengths and weights
Measure using non-standard units

2. Key concepts

Concept 1: Compare lengths and weights.
Concept 2: Measure using non-standard units.

3. Important terms and formulas

Term / Formula	Description
Compare lengths and weights…	Compare lengths and weights
Measure using non-standard units…	Measure using non-standard units

4. Worked examples

Example 1. Applying a key concept from this chapter.

Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.

Example 2. A typical exam-style question on measurements.

Solution: Break the problem into steps, use the appropriate formula and verify the answer.

5. Common mistakes

Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.

6. Practice (exam-style)

Define the main term or principle covered in Chapter 4.
Give two real-life examples related to measurements.
Solve a short numerical or descriptive question from this chapter.
State one important formula and explain each symbol.

7. Answer key (hints)

Refer to section 2 (Key concepts) above for the definition.
Examples should be drawn from daily experience and local context.
Apply the formula from section 3, show all steps clearly.
Formula with units — refer to the textbook glossary for symbol meanings.

8. Quick revision

Class 1 Mathematics — Chapter 4: Measurements.
Core idea: Length and Weight using non-standard units.
Key outcomes: Compare lengths and weights; Measure using non-standard units.
Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Comparing length — key words

Long (more length) vs Short (less length). Tall (more height) vs Short (less height). Longest = most length among three or more. Shortest = least length.

A giraffe is TALL, a cat is SHORT. A train is LONG, a car is SHORT. Always compare two or more things.

Non-standard units of length

Handspan (viral kadai) — distance from thumb tip to little finger tip when hand is stretched. Cubit (muzham) — distance from elbow to middle fingertip. Footspan — length of one's foot. Pace — one full step.

These are called non-standard units because every person's handspan and footspan are different. Amma's handspan is bigger than a child's handspan. That's why we need standard units like centimetre and metre (introduced in later classes).

Comparing weight — without a scale

Hold one object in each hand and feel which is heavier. Heavier = more weight, pulls hand down more. Lighter = less weight. OR use a simple balance (tharaasu): the heavier side goes down.

Bigger does NOT always mean heavier. A big balloon is lighter than a small stone. Weight and size are different things.

Comparing capacity — holds more or less

Pour water from one container to another. The container that can hold more water has MORE capacity. A bucket holds more than a glass. A tumbler holds more than a spoon.

Capacity means how much a container can hold inside it. A big container may not always hold more if it is very shallow.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Thinking bigger objects are always heavier

✓ A big empty cardboard box is lighter than a small stone. Size and weight are different. Always hold and feel to compare weight.

WATCH OUT

✗ Measuring with handspan but leaving gaps between fingers

✓ Place thumb and little finger touching the surface. Count each handspan carefully with no gaps and no overlapping.

WATCH OUT

✗ Not starting the measurement from the edge of the object

✓ Always start the handspan, footspan, or pace from the very edge of what you are measuring. If you start in the middle, the measurement will be wrong.

WATCH OUT

✗ Confusing tall and long

✓ TALL = standing up (height of a person, bottle, tree). LONG = lying flat (length of a pencil, table, road).

Practice problems

Try each one yourself before tapping "Show solution". Active recall > rereading.

Q1EASY· Compare

Which is longer: a pencil or a blackboard?

▶ Show solution

Blackboard

Q2EASY· Compare

Which is heavier: a football or a table?

▶ Show solution

Table

Q3EASY· Non-standard unit

What body part can you use to measure the length of your desk?

▶ Show solution

Handspan (viral kadai) or cubit (muzham)

Q4MEDIUM· Apply

Ravi measured his desk as 6 handspans. His Amma measured the same desk as 4 handspans. Why are the numbers different?

▶ Show solution

Because Amma's handspan is bigger than Ravi's handspan. Bigger handspan = fewer handspans to cover the same length. This is why non-standard units can give different results.

Q5MEDIUM· Capacity

Which holds more water — a bucket or a mug? Why?

▶ Show solution

A bucket holds more water because it is bigger and deeper. You need many mugs of water to fill one bucket.

Q6HARD· Reasoning

A big pillow and a small stone — which is heavier? Why?

▶ Show solution

The small stone is heavier because it is made of solid rock. The big pillow is filled with soft cotton which is very light. Big size does NOT always mean more weight.

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Length comparison: long/short, tall/short, longer/shorter, longest/shortest.
•Non-standard units: Handspan (viral kadai), Cubit (muzham), Footspan, Pace (step).
•Weight comparison: heavy/light, heavier/lighter, heaviest/lightest.
•Capacity: holds more/holds less. A bucket holds more than a glass.
•Key insight: Big size ≠ heavy weight. Non-standard units give different results for different people.
•This is why standard units (cm, m, g, kg) were invented — to give the same measurement for everyone.

Tamil Nadu (TNBSE) marks blueprint

Where the marks come from in this chapter — so you can plan your prep.

Typical chapter weightage: 4-6 marks in TN Class 1 Term 2 Mathematics exam

Question type	Marks each	Typical count	What it tests
Comparison (tick/circle)	1 each	3-4	Tick the longer, shorter, heavier, lighter object from picture pairs
Hands-on measurement	1-2	1	Measure an object with handspan/footspan and write the count
Reasoning	1-2	1	Why do different people get different handspan counts for the same object?

Prep strategy

Practise comparing objects at home — which book is heavier, which spoon is longer, which glass holds more water
Measure 5 things at home using your handspan and write the results
Understand WHY non-standard units give different results for different people
Play the 'heavier-lighter' game: close your eyes, hold two objects, guess which is heavier

Where this shows up in the real world

This chapter isn't just an exam topic — it lives in the world around you.

Measuring with the body

Before rulers existed, people used body parts to measure. Tailors in India still use handspans. Farmers estimate field lengths in paces. This chapter connects children to that ancient practice.

Comparing weights at the market

At the sabzi mandi, shopkeepers weigh vegetables. Children see weighing and comparing weights every day. This chapter gives them the vocabulary: heavy, light, heavier, lighter.

Exam strategy

Battle-tested tips from teachers and toppers for this chapter.

Comparison questions: Look carefully at the two pictures. The clearly bigger/longer/taller one is the answer.
Handspan questions: Show your counting step by step. Write the number clearly.
Reasoning questions: Use the key phrase — 'because everyone's handspan size is different.'
Don't confuse heavy/light (weight) with big/small (size). Read the question to know which is being asked.

Going beyond the textbook

For olympiad aspirants and curious learners — topics that build on this chapter.

If your desk is 6 handspans and your friend's desk is 4 handspans, whose desk is longer? (We can't tell without knowing whose handspan was used!)
Order 5 objects from lightest to heaviest by only feeling them with closed eyes.
Estimate: How many mugs of water will fill this bucket? Then actually try it.

Where else this chapter is tested

CBSE board isn't the only one — other exams test this chapter too.

TN School Term 2 ExamHigh

School Unit TestsHigh

Maths Olympiad (IMO Class 1)Medium

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Questions students ask

The real ones — pulled from the Q&A community and tutor sessions.

Because everyone's hand is a different size. A person with bigger hands will need fewer handspans to cover the same length. This is why we need standard units like centimetres.

Yes! A big balloon is very light, but a small iron nail is heavy. Weight depends on what the object is made of, not just its size.

TALL is used for things that stand up — a person, a tree, a bottle. LONG is used for things that lie flat — a pencil, a road, a rope.

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