CLASSIII MATHEMATICS Chapter 1 NUMBERS UPTO 9 999

CLASS-III, MATHEMATICS Chapter 1 NUMBERS UPTO 9, 999

BASICS OF THE CHAPTER • One thousand • Place value • Expanded from • Predecessor & Successor • Ordering of numbers

NUMBERS THAT WE KNOW UPTO 999 • Let' us know numbers beyond 999 • One more than greatest 3 digit number i, e • 999 + 1 = 1000(Smallest 4 digit number)

PLACES • Every digit has a particular place in a number. • Let's take 1489

PLACES IN ABACUS • Places of a four digit number-4123 • 4 -Thousands , 1 -Hundreds , 2 -Tens , 3 -Ones

POWER OF THE PLACES • 10 ones = 1 ten • 10 tens = 1 hundred • 10 hundreds = 1 thousand

PLACE VALUE • Place value - The value obtained as the product of the digit itself and it's place in the number.

UNDERSTANDING PLACE VALUE • 1 -thousand or 1000 , 2 - hundred or 200 , 3 tens or 30 , 7 -ones or 7

PLACE VALUE OF A NUMERAL • Consider a numeral 5623 • The place value of 3 is 3 ones =3 • The place value of 2 is 2 tens =20 • The place value of 6 is 6 hundreds = 600 • The place value of 5 is 5 thousads = 5000

EXPANDED FORM • The way of writing a numeral as the sum of the place values of its digits.

WRITING THE EXPANDED FORM. . .

EXPANDED FORM IN 2 WAYS. . • Let us consider 4567 • 4567=4 thousand+5 hundred+6 tens+7 ones • = 4000 + 500 + 60 + 7

SUCCESSOR & PREDECESSOR • Successor is the number that comes just after a particular number Or the next number. • Successor of 4699 = 4699+1= 4700 • Predecessor is the number that comes just before a particular number Or the previous number. • Predecessor of 4699= 4699 -1= 4698

COMPARISON OF NUMBERS • COMPARING TWO NUMBERS • Step-I : Compare the number of digits in the given numerals. • Step-II : If both have same number of digits compare the digits at greatest place. • Step-III : If they are same, compare the next place and so on. . . • Exp: 3547 & 3574 , In th. Place 3=3 , hundreds place 5=5 but in tens place 4<7, hence • 3547 < 3574

COMPARISON ACTIVITY

ASCENDING ORDER

NUMBERS IN ASCENDING ORDER

DESCENDING ORDER

NUMBERS IN DESCENDING ORDER

ASSIGNMENTS. . 1. Write the number names a. 4201 b. 9999 c. 7002 2. Draw an abacus to represent a. 3040 b. 4861 3. Fill in the blanks. a. 1000= ___ tens b. _____ hundreds = 1 thousand 4. Wite the place and place value of 7 in the following numerals. a. 3710 b. 7541 c. 3217 5. Compare the following(Using <, >, or =) a. 3845 _ 3854 b. 7003 _ 7002 c. 5014 _ 5014 Continues. . . .

ASSIGNMENTS. . . . 6. Rewrite the following in ascending order. 5643 ; 5634 ; 5436 ; 5346 ; 5463 7. Rewrite the following in descending order. 2097 ; 8709 ; 999 ; 4870 ; 4274 8. HOTS : Find the sum and difference of the place values of 3 and 9 in the following numerals. a) 9537 b) 4903

KEYWORDS. . . 1. Place-The position of the digit in a number. e. g : Ones, tens, hundreds etc. . . 2. Place value- Product of the place and the face value. 3. Expanded form- The way of expressing a number as the sum of the place values of its digits. 4. Predecessor-The number that comes just before a particular number is known as the predecessor. 5. Successor- The number that comes just after a particular number is known as the successor. 6. Ascending Order-An order in which numbers are arranged from smallest to greatest. 7. Descending order-An order in which the numbers are arranged from greatest to smallest.

THANK YOU �� Courtesy DAV INSTITUTIONS ODISHA ZONE-1