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Numbers in General Form

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Let us take the number 52 and write it as 
52 = 50 + 2 = 10 × 5 + 2 
Similarly, the number 37 can be written as 
37 = 10 × 3 + 7 
In general, any two digit number ab made of digits a and b can be written as 
ab = 10 × a + b = 10a + b 
What about ba? 
ba = 10 × b + a = 10b + a
In general, a 3-digit number abc made up of digits a, b and c is written as 
abc = 100 × a + 10 × b + 1 × c 
= 100a + 10b + c
In the same way,
cab = 100c + 10a + b 
bca = 100b + 10c + a      and so on.

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