CLASS II MATHEMATICSLesson 3: Three-Digit Numbers

In a 3 digit number:

• The first place from the right

is the one’s place.

• The second place from the

right is the ten’s place.

• The third place from the right

is the hundred’s place.

CLASS work

Thus, we have the following chartas shown below:

Hundreds Tens Ones

H T O

NUMBER NAMES A number name denotes

how we read out a numeral. To read a 3- digit number,

we first read the hundred’splace, followed by thenumber formed by the lasttwo digits.

For example:-196 is read as– one hundred ninety six

Before-After- Between Write the number which comes

just before:a) 172, 173 b)399, 400

Write the number which comesjust aftera)309, 310 b)471, 472

Write the number which comes inbetween

a) 136, 137, 138b) 701, 702, 703

3-digit Numbers on the AbacusLook at the abacus shown below It has three spikes showing

Ones (O), Tens (T) andHundreds(H) respectively,

Each having some beads.

In the Abacus shown, there are2 beads in the hundred’s spike,3 beads in the ten’s spike and 1bead in the one’s spike.

So, the number has 2 hundreds,3 tens and 1 ones.

Thus, the number shown on theabacus is 231

FACE VALUE AND PLACE VALUEFace value

The face value of a digit in a number is the actual value of the digit at whatever place it may be.

Thus, in the number 654,the face value of 6 is 6,the face value of 5 is 5,the face value of 4 is 4.

PLACE VALUE

The value of a digit based on its placein a number is called its place value.

Consider the number 632 in the placevalue chart as shown below

H T O

6 3 2

Here, the place value of 2 in 632 =2 ones =2

The Place value of 3 in 632 =3 tens =30

The place value of 6 in 632 =6 hundreds = 600

The place value of a digit changes,if its place changes.

Expanded Form and Short Form Consider a number 759. We know that: 759 = 7 hundreds

+ 5 tens + 9 ones = 700 + 50 + 9 700 + 50 + 9 is the expanded

form of 759 759 is the short form of 700 + 50

+ 9

Ascending OrderRearranging in ascending (increasing) order:Example- 259, 648, 175, 312, 840, 468Ans:- 175, 259, 312, 468, 648, 840

Descending OrderRearranging in descending (decreasing) order.Example: 520, 479, 602, 398, 501, 497Ans:- 602, 520, 501, 497, 479, 398

Comparison of Numbers To compare two given numbers

means to find which of the twonumbers is greater or less thanthe other.

Compare the numbers and putthe symbol less than (<), greaterthan (>) or equal to (=)

Example: 103<637637> 574547= 547

Home AssignmentQ1. Write the number names

245-345-456-567-657-777-800-900-

Q2. Write the number whichcomes in between

a) 137, ___, 139 b) 762, ___, 764Q3. Write the number whichcomes just after

a) 138, ___ b) 769, ___ c) 310, __Q4. Write the number whichcomes just before

a) __, 173 b) __, 400 c) __, 390

Q5. Put a ring around thesmallest number:

389 493 349 560Q.6 Put a ring around thegreatest number:

623 711 945 687Q.7 Compare the numbers andput >, < or =a) 316 __ 623 b)711 ___ 945 c) 687 __ 687 d) 261 ___ 181

Q.8 Fill in the blanks.a) In 329, 3 is at the ____ place. Its

place value is ____.b) In 825, 2 is at the ____ place. Its

place value is ____.c) In the number 948, Place value

of 8 is ____d) In the number 106, Place value

of 0 is ____Q.9 Write the missing numbera) 101, 102, ___, ___, ___, ___, 107,

___, ___, 110

Q.10 Rearrange in ascending order.a) 325, 648, 175, 312, 490, 122b) 385,712,456,721,654,465Q.11 Rearrange in descending order.a) 520, 479, 602, 398, 501, 497b) 159, 519, 345, 256, 451, 591Q.12 In the number 356, the face

value of 6 is ___, face value of 5 is ___ and face value of 3 is ___.

Lesson-I: REVISION (2-DIGIT Numbers)

Q1. Fill in the blanksa) ___ is just before 60.b) 91 is just after ____c) 56 comes between ___ and ____d) 59 is ___ tens and ___ ones.e) 2 tens and 4 ones = ____Q2. Arrange in Ascending Order:a) 63,81,29,13,75Q3. Arrange in Descending Order:a) 28,81,57,95,70

Q4. Add:

Q5. Subtract: