The following table shows how the cardinal numbers between 1 and 10 are expressed:

The number 0 has many names:

When we talk about the number itself or when we are reading percentages and decimals, we say zero.

'Oh' is another name for the number 0. It is used when saying phone numbers, years, addresses, temperatures, time, etc.

Nil is used in sports scores.

Nought is the British English equivalent of zero. It is used instead of zero in several ways.

'Love' is the name of the number zero in tennis scores.

Eleven, twelve, and twenty have individual forms. But other numbers from 14 to 19 have a similar pattern. Please note the peculiarities of spelling. Let's get to it:

The tens have special names which you should memorize, however, they have a pattern. Please note the exceptions in spelling. Let's get to it:

After 20, use the tens (twenty, thirty, etc.) followed by numbers one through nine.
Hyphenate all compound numbers between twenty-one and ninety-nine.

Look at some more examples:

For 100, we can either use the definite article 'a' or 'one'.

For three-digit numbers, use the following pattern:

Four-digit numbers are formed using any digits from 0-9, but the number should begin with digit 1 or a number greater than 1. To write numbers beyond 1,000 (one thousand) you can follow the same pattern as the three-digit numbers:

In math, every digit in a number has a place value. Place value is the value of a digit in a number on the basis of its position in the number. Understanding the place value of digits in numbers helps in writing numbers in their expanded form.

In 24568:

The International numeral system is used worldwide in which we count in the order of ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, and so on. In this place value chart, the numbers are grouped into periods of ones, thousands, millions, and so on, and they are separated by a comma every 3 digits, starting from the right side.