# Cl-5 (Math) | Ch-2 | Large Numbers

• Class 4

## Learning Objective

On successful completion of this lesson, students will be able to:

• demonstrate basic knowledge of numbers, largest number , smallest number.
• analyze how to write numbers.
• develop problem-solving skills.
• apply in real life.

## Dictionary

• Number: 1, 2, 3 etc.
• >: Greater than
• <: Lesser than
• =: Equal to
• Ascending: Increasing
• Descending: Decreasing
• Order: Sequence
• Digit: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

### 2.1 Introduction

=> Digit: 0, 1, 2, 3, 4, 5, 6, 7, 8 & 9 are called digits.

=> Number: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, 11 etc. are called Numbers.

### 2.2 Indian Place Value Chart

#### 2.2.1 Periods in a place value chart

=> In Indian Place Value Chart , the nine places are grouped into four periods namely Ones, Thousands , Lakhs, Crores.

=> These periods are arranged from Ones to Crores towards left to right as shown below:

#### 2.2.2 Places in a place value chart

=> Ones Period has three places: Ones (O), Tens (T) & Hundreds (H).

=> Thousands Period has two places: Thousands (TH) & Ten Thousands (TTH).

=> Lakhs Period has two places: Lakhs (L) & Ten Lakhs (TL)

=> Crores Period has two places: Crores (C) & Ten Crores (TC).

=> Places are shown below:

#### 2.2.4 How to Write Number

=> We use commas (,) to separate the periods. Let’s see by an example

e.g 2.1 Write the number 345689346 by separating the periods.

Sol.

Step 1: Draw the indian place value chart & put the number.

Step 2: Rewrite these numbers here by separating commas at its period i.e 34,56,89,346 Ans.

Quick It: Put commas after three digits and then put after every two digits i.e 34,56,89,345

### 1.4 Practice Sets

1. Fill Type
2. Match Type
3. Order Type
4. Conversion Type
5. Compare Type
6. Error Type
7. Statement Type
8. True/False Type
9. Related Type
10. Day-to-Day Type
11. Miscellaneous Type

#### Set-1

1.Write the Roman numeral for each of the following Hindu-Arabic numerals.

2. Write the Hindu-Arabic numerals corresponding to each of the following.

3. Which of the following are meaningless?

4. Compare and put symbol >, < or =in the placeholder.

5. Fill in the blanks.

6. Cross (x) the Roman numerals which are not written correctly.

7. Write the following Roman numerals in ascending order.

8. Write the following Roman numerals in descending order.

9. Solve & write the answer in Roman numerals.

10. Complete the following table.

Ans: 1 ( ), 2( ), 3( ), 4( ), 5( ), 6( ), 7( ), 8( ), 9( ), 10( )

#### Set-2

Ans: 1 ( ), 2( ), 3( ), 4( ), 5( ), 6( ), 7( ), 8( ), 9( ), 10( )

#### Set-3

Ans: 1 ( ), 2( ), 3( ), 4( ), 5( ), 6( ), 7( ), 8( ), 9( ), 10( )

#### Set-4

Ans: 1 ( ), 2( ), 3( ), 4( ), 5( ), 6( ), 7( ), 8( ), 9( ), 10( )

#### Set-5

Ans: 1 ( ), 2( ), 3( ), 4( ), 5( ), 6( ), 7( ), 8( ), 9( ), 10( )

### 1.5 Quiz

1.In Roman numerals, there are only……… basic symbols.

(a). 7 (b). 9 (c). 10 (d). 8

2. Roman numeral for the smallest 4-digit number is

(a). X (b). C (c). M (d). D

3. Which of the following numerals cannot be repeated?

(a). I (b). V (c). X (d). C

4. IX+XV+XX=

(a). 35 (b). 40 (c). 44 (d). 45

5. I can be subtracted from

(a). V (b). V&X (c). X&C (d). V,X&C

6. Compare: CDXLIX ( ) CDLX

(a). > (b). < (c). = (d). None

7. XIX + XXIX=

(a). XXXVIII (b). XLVII (c). XXXIX (d). XLVIII

8. CC – CXXV=

(a). LXV (b). LXXV (c). LXXXV (d). XCV

9. XII /II=

(a). V (b). VI (c). VII (d). VIII

10. XII x X=

(a). CXX (b). CX (c). CXXX (d). None

Ans: 1 (a), 2(c), 3(b), 4(c), 5(b), 6(b), 7(d), 8(b), 9(b), 10(a)

Ans:

1. ..
2. ..
3. ..
4. ..
5. ….
6. ….
7. ….

### 1.7 Exam

The exam will be conducted after the completion of the course.