Elephants, Tigers, and Leopards – Class 4 Maths Chapter 10 Notes & NCERT PDF

Class 4MathematicsChapter 10NCERT book: Maths Mela - Class 4

Notes and a simple summary of Chapter 10 of the NCERT Class 4 Mathematics book, with the official chapter PDF, flashcards, an MCQ quiz and an AI tutor for your doubts.

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Chapter 10: Elephants, Tigers, and Leopards

Introduction

"Elephants, Tigers, and Leopards" is about adding and subtracting 4-digit numbers, set around India's wildlife. The chapter begins with a NIM game and an addition chart, then uses real animal numbers from different states to practise regrouping, and ends with word problems about visitors, juice bottles, vehicles and a school bank.

What's in this Chapter

NIM Game – Two players add 1 or 2 in turn; whoever reaches 10 first wins. If the other player has reached 6, you can add 1 to get 7 and then you are sure to win. If they reach 8, you add 2 and win. Children then try other targets like 11 or 12.

Addition Chart and Reverse-and-Add – Children find patterns in a 0–12 addition table. Adding a 2-digit number to its reverse (27 + 72 = 99) always gives a multiple of 11. Numbers that give 55 are 14, 23, 32 and 41. The smallest 3-digit sum is 110 (19 + 91).

How Many Animals? – India has 3/4 of the world's tigers and 3/5 of the Asiatic elephants (as the book says).

  • Elephants in Karnataka (6049) and Kerala (3054): 6049 + 3054 = 9103. The book shows regrouping: 10 ones = 1 ten, 10 tens = 1 hundred.
  • Leopards in Gujarat (1355), Karnataka (1131) and Madhya Pradesh (1817): total 4303.
  • Maharashtra has 444 tigers; Madhya Pradesh has 341 more (785); Uttarakhand has 116 more than Maharashtra (560).

    • More or Less? – Assam has 5719 elephants, 3965 more than Meghalaya, so Meghalaya has 5719 − 3965 = 1754. Leopards in Central India and the Eastern Ghats were 8820 in 2022, which was 749 more than in 2018, so 2018 had 8071.

    Let Us Do – Kaziranga visitors: December 8591, November 6415 (2176 more in December); October had 1587 fewer than November, i.e. 4828. Juice factory: pineapple 1348, guava 759 more (2107), orange 1257 more than guava (3364), passion fruit 4781. Vehicles: jeeps 6304, buses 253 more (6557), tractors 5247 fewer than buses (1310), taxis 1579 more than tractors (2889).

    School Panchayat Bank – Raju, Rani and Roja deposit ₹2045, ₹3578 and ₹1240 and fill deposit slips with notes of 500, 100, 50, 10 and coins of 5, 2, 1. Raju's slip: 3 × 500 + 3 × 100 + 2 × 50 + 14 × 10 + 1 × 5 = ₹2045.

    Smart ways – 8787 − 99: subtract 100, then add 1 (8688). If 139 + 175 = 314 then 314 − 175 = 139.

    Key Ideas

  • Line up thousands, hundreds, tens and ones before adding or subtracting.
  • Regroup: 10 ones = 1 ten, 10 tens = 1 hundred, 10 hundreds = 1 thousand.
  • Estimate first (6049 + 3054 is about 9000) to check if an answer makes sense.
  • "More than" often means add; "less than" or "how many more" often means subtract.
  • Addition and subtraction are linked: one fact gives another.

    • Activities from the Book

  • Play NIM with different targets and find the winning numbers.
  • Fill number sequences like 2540, 2590 … and 7645, 7670 ….
  • Complete the India map with elephant, tiger and leopard numbers.
  • Fill a deposit slip using different combinations of notes.

    • Words to Learn

  • Regroup – exchange 10 of one place for 1 of the next (हासिल लेना/देना)
  • Estimate – approximate answer (अनुमान)
  • Sum – answer of addition (योग)
  • Difference – answer of subtraction (अंतर)
  • Endangered – at risk of dying out (संकटग्रस्त)
  • Biodiversity – variety of living things (जैव विविधता)
  • Deposit – put money in a bank (जमा करना)
  • Census – official count (जनगणना)

    • Tips for Parents & Teachers

  • Use number tokens (1000, 100, 10, 1) to show regrouping.
  • Draw box diagrams for "more than / less than" problems.
  • Play NIM at home and ask, "Why did you win?"
  • Talk about wildlife sanctuaries in your own state.

    • Common Mistakes

  • Forgetting to carry or borrow while regrouping.
  • Subtracting the smaller digit from the bigger one in each column regardless of order.
  • Adding when a problem says "how many more".

    • 💡 Key Learning Points

    • ✓Add and subtract 4-digit numbers by lining up places and regrouping.
    • ✓Estimate before calculating to check answers.
    • ✓Understand 'more than' and 'less than' word problems using box diagrams.
    • ✓Use smart strategies (subtract 100 then add 1) and related facts.
    • ✓Find patterns in games (NIM), addition charts and reverse-and-add.

    👨‍🏫 Teaching Tips

    • →Use Dienes blocks or number tokens to model regrouping before the column method.
    • →Draw box diagrams for compare and change problems, as the Note for Teachers suggests.
    • →Play NIM in pairs and discuss winning numbers.
    • →Bring real wildlife numbers from your state for extra problems.
    • →Let children fill mock deposit slips with different note combinations.
    • →Ask children to share their own quick ways for sums like 4990 + 310.

    📋 Assessment Questions

    1. Can the child add and subtract 4-digit numbers with regrouping?
    2. Can the child solve a two-step word problem (juice or vehicles)?
    3. Can the child estimate a sum or difference?
    4. Can the child explain a winning strategy in NIM?

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    All chapters in Maths Mela - Class 4

    1. 1. Shapes Around Us
    2. 2. Hide and Seek
    3. 3. Patterns Around Us
    4. 4. Thousands Around Us
    5. 5. Sharing and Measuring
    6. 6. Measuring Length
    7. 7. The Cleanest Village
    8. 8. Weigh It, Pour It
    9. 9. Equal Groups
    10. 10. Elephants, Tigers, and Leopards
    11. 11. Fun with Symmetry
    12. 12. Ticking Clocks and Turning Calendar
    13. 13. The Transport Museum
    14. 14. Data Handling