📘 Class-6 Chapter Whole Numbers – Exercise 2.1 Introduction to Whole Numbers (Successor, Predecessor, Number Patterns) (Worksheet 50 Questions)

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🔢 1. Understanding Whole Numbers

  • Whole numbers = 0, 1, 2, 3, 4, …
  • Inclusion of 0 (unlike natural numbers)
  • Smallest whole number = 0
  • No largest whole number (they go on forever)

🔄 2. Successor (Next Number)

  • The number that comes just after a given number
    👉 Formula: Successor = Number + 1

Example:
Successor of 25 = 26

🔙 3. Predecessor (Previous Number)

  • The number that comes just before a given number
    👉 Formula: Predecessor = Number − 1

Example:
Predecessor of 25 = 24

📌 Important:

  • 0 has no predecessor in whole numbers

🔢 4. Number Sequence / Ordering

  • Writing numbers in order:
    • Increasing order → 1, 2, 3…
    • Decreasing order → 10, 9, 8…
  • Understanding before, after, between

🔍 5. Filling Missing Numbers

  • Completing sequences like:
    • 5, 6, ___, 8
    • 100, ___, 102

🧠 6. Basic Observations

  • Every whole number has:
    • A successor
  • Only one number has:
    • No predecessor → 0

🔢 Section A: Write the Next Three Whole Numbers

  1. 12, ___, ___, ___
  2. 45, ___, ___, ___
  3. 99, ___, ___, ___
  4. 120, ___, ___, ___
  5. 1000, ___, ___, ___
  6. 567, ___, ___, ___
  7. 89, ___, ___, ___
  8. 250, ___, ___, ___
  9. 4001, ___, ___, ___
  10. 9999, ___, ___, ___

🔍 Section B: Write the Previous Three Whole Numbers

  1. 15, ___, ___, ___
  2. 100, ___, ___, ___
  3. 500, ___, ___, ___
  4. 1000, ___, ___, ___
  5. 75, ___, ___, ___
  6. 300, ___, ___, ___
  7. 999, ___, ___, ___
  8. 60, ___, ___, ___
  9. 4500, ___, ___, ___
  10. 200, ___, ___, ___

✍️ Section C: Fill in the Blanks

  1. The smallest whole number is ______
  2. The successor of 199 is ______
  3. The predecessor of 500 is ______
  4. There is ______ (smallest/largest) whole number
  5. Whole numbers start from ______
  6. The predecessor of 1 is ______
  7. The successor of 0 is ______
  8. 0 is a ______ number
  9. Whole numbers do not include ______ numbers
  10. The number just before 100 is ______

🧠 Section D: True or False

  1. 0 is the smallest whole number
  2. Every whole number has a predecessor
  3. Whole numbers include negative numbers
  4. 1 is the successor of 0
  5. Whole numbers are infinite
  6. 5 has two successors
  7. The predecessor of 100 is 99
  8. 0 has no predecessor
  9. Whole numbers start from 1
  10. 999 comes after 1000

🔄 Section E: Short Answer Questions

  1. Write all whole numbers between 5 and 10
  2. Write all whole numbers between 20 and 25
  3. Find the successor of 10,000
  4. Find the predecessor of 1
  5. How many whole numbers are there between 7 and 9?
  6. Write the smallest 3-digit whole number
  7. Write the largest 2-digit whole number
  8. What comes just after 999?
  9. What comes just before 1000?
  10. Write three whole numbers greater than 500

🧩 Section F: Case-Based Questions

📦 Case Study 1: Library Books

A school library has 2,500 books. Every month, the librarian adds 10 new books.

  1. How many books will the library have after 1 month?
  2. Write the next three numbers showing the increase in books.
  3. What is the successor of 2,500?
  4. What is the predecessor of 2,500?

🏫 Case Study 2: School Attendance

A school has 1,200 students. On Monday, 1,180 students were present.

  1. How many students were absent?
  2. Write the predecessor of total students.
  3. Write the successor of students present.
  4. Is 1,200 a whole number?

🚗 Case Study 3: Parking Lot

A parking lot can hold 300 cars. Today, 298 cars are parked.

  1. How many more cars can be parked?
  2. What is the successor of 298?
  3. What is the predecessor of 300?
  4. Write three numbers just before 298.

🏃 Case Study 4: Marathon Race

In a race, 500 participants registered. Only 495 completed the race.

  1. How many did not finish the race?
  2. Write the predecessor of 495.
  3. Write the successor of 500.
  4. Are all these numbers whole numbers?

🏬 Case Study 5: Shopping Mall Visitors

A mall had 9,999 visitors yesterday. Today, the number increased.

  1. What is the next number after 9,999?
  2. Write three numbers after 9,999.
  3. What is the predecessor of 10,000?
  4. Is there any largest whole number?

✅ ANSWER KEY

Section A

  1. 13, 14, 15
  2. 46, 47, 48
  3. 100, 101, 102
  4. 121, 122, 123
  5. 1001, 1002, 1003
  6. 568, 569, 570
  7. 90, 91, 92
  8. 251, 252, 253
  9. 4002, 4003, 4004
  10. 10000, 10001, 10002

Section B

  1. 14, 13, 12
  2. 99, 98, 97
  3. 499, 498, 497
  4. 999, 998, 997
  5. 74, 73, 72
  6. 299, 298, 297
  7. 998, 997, 996
  8. 59, 58, 57
  9. 4499, 4498, 4497
  10. 199, 198, 197

Section C

  1. 0
  2. 200
  3. 499
  4. No largest
  5. 0
  6. 0
  7. 1
  8. Whole
  9. Negative
  10. 99

Section D

  1. True
  2. False
  3. False
  4. True
  5. True
  6. False
  7. True
  8. True
  9. False
  10. False

Section E

  1. 6, 7, 8, 9
  2. 21, 22, 23, 24
  3. 10001
  4. 0
  5. 1
  6. 100
  7. 99
  8. 1000
  9. 999
  10. Example: 501, 502, 503

Section F

  1. 2,510
  2. 2,510, 2,520, 2,530
  3. 2,501
  4. 2,499
  5. 20
  6. 1,199
  7. 1,181
  8. Yes
  9. 2
  10. 299
  11. 299
  12. 297, 296, 295
  13. 5
  14. 494
  15. 501
  16. Yes
  17. 10,000
  18. 10,000, 10,001, 10,002
  19. 9,999
  20. No
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