Class 1 Numbers

Numbers and Number Names

One-digit Numbers

Numbers from 1 to 9 are called 1-digit numbers. We need one place or one digit to write one-digit numbers. Let’s write the number names of one-digit numbers.

Numbers	Number names
1	One
2	Two
3	Three
4	Four
5	Five
6	Six
7	Seven
8	Eight
9	Nine

Two-digit Numbers

Numbers from 10 to 99 are called 2-digit numbers. We need two places and two digits to write two-digit numbers. The two places to write two-digit numbers are Ones place and Tens place. Let’s write the number names of two-digit numbers.

Numbers	Number names
10	Ten
11	Eleven
12	Twelve
13	Thirteen
14	Fourteen
15	Fifteen
16	Sixteen
17	Seventeen
18	Eighteen
19	Nineteen
20	Twenty
21	Twenty-one
22	Twenty-two
23	Twenty-three
24	Twenty-four
25	Twenty-five
26	Twenty-six
27	Twenty-seven
28	Twenty-eight
29	Twenty-nine
30	Thirty

Similarly, we can write the number names of the remaining two-digit numbers from 31 to 99.

To write three-digit numbers, we need three digits and three places. We will study the three-digit numbers in your next class.

Before, After and In Between

Look at the numbers 6, 7 and 8.

1 2 3 4 5 6 7 8 9

6 is just before 7.

7 is in between 6 and 8.

8 is just after 7.

Now, write the numbers that comes before, after and in between the given numbers.

Tens and Ones

We know that, to write two-digit numbers, we need two places – Ones and Tens.

Let’s write a few numbers in ones and tens columns.

Numbers	Ones	Tens
11	1	1
23	2	3
35	3	5
48	4	8

In a two-digit number, the first place from right is ones place and the second place from right is the tens places.

In 11, there are 1 one and one ten. In 23, there are 3 ones and 2 tens. In 35, 5 ones and 3 tens. In 48, there are 8 ones and 4 tens.

Comparing Numbers

Here, 7 is less than 9. It can be written as 7 < 9.

And, 9 is greater than 7. It can be written as 9 > 7.

“<” is called less than symbol and “>” is called greater than symbol.

If two numbers are equal, then we write it as 8 = 8. “=” is equal to symbol.

Smallest Number / Greatest Number

In the three numbers given in the circles above, 18 is the smallest number.

In the three numbers given in the circles above, 82 is the greatest number.

Ordering Numbers

We can arrange the given numbers in two different orders. One is from the smallest to the greatest and the other is from the greatest to the smallest.