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Tamil Nadu (TNBSE)Class 2 Mathematics★ 3-4 marks in TN Class 2 Term 1 and Term 2 exams — pattern identification, extension, and creating patterns with shapes and numbers

Patterns

Samacheer Kalvi (TN State Board) Class 2 Mathematics — Chapter 3, Patterns. Repeating blocks and number sequences. 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…

1Identify and extend patterns in shapes (○□○□○ → □), colours (red, blue, red, blue → red), and sounds (clap, tap, clap, tap → clap)
2Identify and extend number patterns: skip counting by 2s (2, 4, 6, 8…), by 5s (5, 10, 15…), by 10s (10, 20, 30…)
3Identify the core (repeating unit) of a pattern: in '○□○□○□', the core is '○□'
4Create own patterns using shapes, numbers, and body movements
5Understand growing patterns: 1, 2, 3, 4… or 1, 3, 5, 7… (introduction to odd numbers)

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Why this chapter matters

Pattern recognition is the root of mathematical thinking. When a child sees ○□○□ and predicts what comes next, they are doing the same kind of logical reasoning that later powers algebra, coding, and problem-solving. Class 2 builds on Class 1 by introducing number patterns (2, 4, 6, 8, … — skip counting) alongside shape and colour patterns. Children also learn to identify the repeating unit (core) of a pattern — an abstraction skill that is surprisingly sophisticated for their age.

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Patterns — Class 2 Mathematics (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 2 Mathematics, Chapter 3. Repeating blocks and number sequences.

1. About this chapter

This chapter covers Patterns as part of the Class 2 Samacheer Kalvi Mathematics curriculum. It deals with repeating blocks and number sequences and builds conceptual understanding essential for the TN School Term Exam.

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

Continue repeating block patterns
Create simple number sequences

2. Key concepts

Concept 1: Continue repeating block patterns.
Concept 2: Create simple number sequences.

3. Important terms and formulas

Term / Formula	Description
Continue repeating block patterns…	Continue repeating block patterns
Create simple number sequences…	Create simple number sequences

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 patterns.

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 3.
Give two real-life examples related to patterns.
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 2 Mathematics — Chapter 3: Patterns.
Core idea: Repeating blocks and number sequences.
Key outcomes: Continue repeating block patterns; Create simple number sequences.
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.

Repeating patterns

A pattern has a unit that repeats. In '★●★●★●', the unit is '★●'. This unit repeats 3 times. In 'ABCABCABC', the unit is 'ABC'.

To find the next item, look for what repeats. Ask: 'What came before? Is there a repeating group?' Circle the repeating unit with your finger.

Number patterns — Skip counting

Skip by 2s: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 (even numbers). Skip by 5s: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. Skip by 10s: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Skip counting is the bridge to multiplication tables. When you say 5, 10, 15, 20, you are actually reciting the 5 times table: 5×1=5, 5×2=10, 5×3=15, etc.

Growing patterns

A growing pattern increases or decreases by a fixed rule: 1, 2, 3, 4, … (add 1 each time). 2, 4, 6, 8, … (add 2 each time). 10, 8, 6, 4, … (subtract 2 each time).

Growing patterns are the first step towards understanding sequences and arithmetic progressions — topics they will study formally in Class 10.

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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

✗ Looking at only the last item instead of the whole repeating unit

✓ In '◼◼●◼◼●◼◼●__', looking at just the last ● might make you think the next is ●. But look at the whole unit '◼◼●' — after ● comes ◼, so the next should be ◼.

WATCH OUT

✗ Skipping 15 when skip counting by 5s (5, 10, 20…)

✓ Recite with your fingers: show 1 finger → 5, 2 fingers → 10, 3 fingers → 15, 4 fingers → 20. Check each step.

WATCH OUT

✗ Thinking a pattern can only be shapes and colours

✓ Patterns are everywhere: the beat of a song (dhum-dhum-chak-dhum-dhum-chak), the arrangement of tiles on the floor, even the way day follows night. Any regular repetition is a pattern.

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