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### Theory:

Numbers can be expressed in three forms. They are as follows:
1. Standard form
2. Expanded form
3. Written form
Standard form: The standard form is nothing but the mathematical form of the number.
Example:
The number $$425$$ - Standard form.

Similarly, $$8756, 369824, 587469123$$ are also the standard forms of numbers.
Expanded form: Split a number according to their place value and expand it to show the value of each digit is called the expanded form.
Example:
For the same set of numbers $$425, 8756, 369824, 587469123$$, the expanded form will be as follows:

Written form: This can be done by directly converting the expanded form to words.
Example:
For the same set of numbers $$425, 8756, 369824, 587469123$$, all the three forms are listed below.

 Standard form Expanded form Written form (Indian system) Written form (International system) $$425$$ $$400+20+5$$ Four Hundred Twenty-Five Four Hundred Twenty-Five $$8756$$ $$8000+700+50+6$$ Eight Thousand Seven Hundred Fifty-Six Eight Thousand Seven Hundred Fifty-Six $$369024$$ $$300000+60000+9000+20+4$$ Three Lakh Sixty Nine Thousand Twenty Four Three Hundred Sixty Nine Thousand Twenty Four $$587469123$$ $$500000000+80000000+7000000+$$$$400000+60000+9000+100+20+3$$ Fifty-Eight Crore Seventy Four Lakh Sixty Nine Thousand One Hundred Twenty Three Five Hundred Eight Seven Million Four Sixty Nine Thousand One Hundred Twenty Three