Numbers up to 1000

• Even and Odd Numbers
• Three Digit Numbers
• Place Value
• Expanded Form of a Number
• Comparing Numbers
• Forming and Ordering of Numbers

Even and Odd Numbers

All the numbers that are ending with 2, 4, 6, 8 and 0 are even numbers
All the numbers that are ending with 1, 3, 5, 7 and 9 are called odd numbers
Look at the numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Even and odd numbers are coming one after the other

In this picture, even number of leaves are coloured in green and odd number of leaves are coloured in purple.

Three Digit Numbers

We have learnt the numbers from 1 to 99.
If we add 1 to 99, we get 100 and we read it as One Hundred.
100 is the first and the smallest 3-Digit Number.
100 + 1 = 101 and is read as One Hundred One
109 + 1 = 110 and is read as One Hundred Ten
199 + 1 = 200 and is read as Two Hundred
250 + 1 = 251 and is read as Two Hundred Fifty-one
999 is the highest 3-Digit Number.

Place Value

Let's consider the number 254.
In 254, 5 is in TENS place.
We can Write 254 = 200 + 50 + 4. The contribution of this particular digit (5) to 254 is 50.
So, we can say, The Place Value of 5 in 254 is 50.
The Place Value of 4 in 254 is 4.
The Place Value of 2 in 254 is 200.

Expanded Form of a Number

In the previous session, we have learnt how to read 3-digit numbers.
Let's consider the number 652.
652 is read as Six Hundred Fifty-Two.
652 is 6 Hundreds + 5 Tens + 2 Ones.
We can say, The expanded Form of 652 is 600 + 50 + 2

Here are some more examples:

Comparing Numbers

We know, when the digits in two numbers are different, the numbers themselves are different.
For example, the digits in 253 and 389 are different and the numbers are also different.
Now we are going to learn which number is bigger and which number is smaller by comparing the numbers.

(i) When the count of digits are different.

Let's Consider 120 and 95.
We know, 95 is smaller than 120 since 95 is a 2-digit number and 120 is a 3-digit number.
95 is smaller than 120 or 95 < 120.
Similarly, 120 is greater than 95 or 120 > 95.

(ii) When the count of digits are the same.

Let's Consider 120 and 230.
Here both the numbers are 3-digit numbers. In this case, first we need to compare the digits at the hundreds place.
We know 1 < 2. So, 120 < 230 or 230 > 120

Let's Consider 120 and 102.
Here both these 3-digit numbers have the same digit at hundreds place. In this case, we need to compare the digits at the tens place.
We know 2 > 0. So we can say, 120 > 102 or 102 < 120

Let's Consider 115 and 117.
Here both the numbers are 3-digit numbers and the digits in both hundreds and tens place are also the same. In this case, we need to compare the digits at the ones place.
We know 5 < 7. So we can say, 115 < 117 or 117 > 115

Forming and Ordering of Numbers

Let's play a game with numbers.
How many 3-digit numbers can you make from the digits 2, 3 and 5?
The rule is that no digit can repeat.
We can make 6 different numbers and they are 325, 235, 523, 532, 352 and 253
Arrange these numbers from the smallest to the biggest?
By using the steps we learnt in the previous session, we can arrange the numbers as below.
235, 253, 325, 352, 523, 532
When we arrange the same numbers from biggest to smallest we will get,
532, 523, 352, 325, 253, 235

• When a set of numbers are arranged from smallest to the biggest, it is called Ascending Order (or increasing Order).
• When a set of numbers are arranged from biggest to the smallest, it is called Descending Order (or decreasing Order).
• The first number in an ascending order is the smallest among the numbers considered.
• The last number in an ascending order is the Greatest among the numbers considered.