📘 Class-6 Chapter Whole Numbers – Exercise 2.4 Number Line & Representation of Whole Numbers (Worksheet 50 Questions)

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🔍 What this Exercise Covers

Exercise 2.4 mainly focuses on:

  • Representing whole numbers on a number line
  • Understanding movement on number line
  • Using number line for addition and subtraction

🔢 1. Number Line Basics

A number line is a straight line where numbers are marked at equal distances.

👉 Key points:

  • Starts from 0
  • Numbers increase towards the right
  • Numbers decrease towards the left

Example:
0 — 1 — 2 — 3 — 4 — 5 — …

➕ 2. Addition on Number Line

👉 Move right to add

Example:
3 + 2

  • Start at 3
  • Move 2 steps right → 5

✔ Answer = 5

➖ 3. Subtraction on Number Line

👉 Move left to subtract

Example:
5 − 3

  • Start at 5
  • Move 3 steps left → 2

✔ Answer = 2

📌 4. Important Observations

  • You cannot go left beyond 0 in whole numbers
  • That’s why subtraction like:
    • 3 − 5 is not possible in whole numbers

🧠 5. Uses of Number Line

  • Comparing numbers
  • Understanding operations visually
  • Learning positive and negative numbers later

✍️ Exercise 2.4 – Worksheet (50 Questions)

🔢 Section A: Represent on Number Line (Write Steps) (1–10)

  1. Show 2 on number line
  2. Show 5 on number line
  3. Show 10 on number line
  4. Show 0 on number line
  5. Show 7 on number line
  6. Show 12 on number line
  7. Show 3 on number line
  8. Show 15 on number line
  9. Show 1 on number line
  10. Show 9 on number line

➕ Section B: Addition Using Number Line (11–20)

  1. 2 + 3
  2. 4 + 2
  3. 5 + 4
  4. 6 + 3
  5. 7 + 2
  6. 8 + 1
  7. 3 + 6
  8. 10 + 2
  9. 9 + 3
  10. 1 + 5

➖ Section C: Subtraction Using Number Line (21–30)

  1. 5 − 2
  2. 6 − 3
  3. 10 − 4
  4. 9 − 2
  5. 8 − 5
  6. 7 − 3
  7. 6 − 6
  8. 4 − 2
  9. 3 − 1
  10. 10 − 7

🧠 Section D: Fill in the Blanks (31–40)

  1. Moving right means ______
  2. Moving left means ______
  3. 0 is the ______ point
  4. Numbers increase towards ______
  5. Numbers decrease towards ______
  6. 5 + 3 = ______
  7. 9 − 4 = ______
  8. 6 − 6 = ______
  9. 2 + 5 = ______
  10. 10 − 10 = ______

🔍 Section E: Reasoning Questions (41–45)

  1. Why can’t we go left beyond 0?
  2. What happens in 3 − 5 on number line?
  3. Why is number line useful?
  4. Which direction shows addition?
  5. Which direction shows subtraction?

🧩 Section F: Case-Based Questions (46–50)

🏫 Case Study: Jump Game

A child stands at 4 on number line.

  1. If he jumps 3 steps right, where will he reach?
  2. If he moves 2 steps left, where will he reach?
  3. Which operation is moving right?

📦 Case Study: Steps Problem

A boy is at 10.

  1. He moves 5 steps left. Where is he now?
  2. Can he move 15 steps left from 10? Why?

✅ Answer Key

Section A

(Answers depend on drawing; points marked correctly)

Section B

  1. 5
  2. 6
  3. 9
  4. 9
  5. 9
  6. 9
  7. 9
  8. 12
  9. 12
  10. 6

Section C

  1. 3
  2. 3
  3. 6
  4. 7
  5. 3
  6. 4
  7. 0
  8. 2
  9. 2
  10. 3

Section D

  1. Addition
  2. Subtraction
  3. Starting
  4. Right
  5. Left
  6. 8
  7. 5
  8. 0
  9. 7
  10. 0

Section E

  1. Because negative numbers are not whole numbers
  2. It goes into negative numbers
  3. Helps visualize numbers
  4. Right
  5. Left

Section F

  1. 7
  2. 2
  3. Addition
  4. 5
  5. No, it goes below 0

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