1 000 000 000 = 109 = (2 x 5)9 = 29 x 59 = 512 x 1953125
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In a 200 billion, there are 11 zeros. This is because a billion is equivalent to one thousand million, which has 9 zeros. Therefore, when you multiply 200 by a billion, you get 200,000,000,000, which has 11 zeros.
7 billion in numbers looks like 7,000,000,000. There are nine zeros in one billion, so you can simply add nine zeros to 7 to get 7,000,000,000.
10,000,000,000
Well, isn't that a happy little question! If we take a look at 400 billion, we see there are 9 zeros in total. Each billion has 9 zeros, so when we have 400 billion, we have 9 zeros for each billion, giving us a total of 9 zeros. Just remember, there are no mistakes, just happy little accidents!
.3 billion would be written as 300,000,000. 1 billion has nine zeros: 1,000,000,000, then you multiply it by .3, and you get the answer above.