A/One hundred, thousand etc.
Incorrect : Hundred years make a century.
Correct : A/One hundred years make a century.
Incorrect : Please lend me thousand taka.
Correct : Please lend me a/one thousand taka.
Note: When you mean “100” or “1000” you must say “a/one hundred’ or 'a/one thousand’. ‘200' is not “two hundreds.” When you use a definite number before "hundred', “thousand” etc. they shall not be in the plural form. However, you can say:
I have been there hundreds of times.
Thousands of people gathered there.
