I never noticed before

And the letter "b" only comes in at a billion.

Oh . . . my gosh

M comes in at a million

It's a way less common letter in the English language.

You would say one hundred. Not a hundred. I think so anyway

Santa you're right. I remember in whatever grade they drilled it in our heads that it's not a hundred its one hundred.

Is the ,,and'' necessary in english spelling?

No, when you say and you're actually putting a decimal so it would be 900.99

NegAtive has an A in it

Yes, but minus does not

Do you say "minus 1" when talking about negative numbers?

You're not supposed to

In America, you would usually say "point" for a decimal, you are correct. But "one hundred AND one" could be interchanged with "one hundred one." Where I live, most people omit the "and" but both ways are correct.

Maybe?