Hi! I'd like to know which is the usage difference between a hundred / a thousand / a millionone hundred / one thousand/ one millionI'm a little confused because a vocabulary dictionary uses "a" instead of "one" while other sources use "one". Thanks a lot for helping.

Grammar

a hundred vs. one hundred

Hi! I'd like to know which is the usage difference between

I'm a little confused because a vocabulary dictionary uses "a" instead of "one" while other sources use "one".

Thanks a lot for helping.

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