the moon and our solar system is about 4.5 billion years old. write 4.5 billion out, in numbers?

Answer 1

They are citing an American billion which is one thousand million or 1,000,000,000. 4.5 billion years is 4,500,000,000 years.

A Chuquet billion is one million million or 1,000,000,000,000.

Answer 2

Actually in a lot of geology and astronomy circles the word billion is not used as there is always the confusion as to which one (10^9 or 10^12) is implied. To avoid the problem scientific notation is often used (eg 4.5 x 10^9 years) or a scientific prefix is used. For example when I was learning physics they often said that the age of the earth is 4.5 giga ana, where giga is 10^9 and ana means years.

Answer 3

I think the standard now is that a billion is 1000 million or 10^9.

I am not sure anyone talks of a million million now. That is accepted as a trillion 10^12.

Any astronomy books for the layperson that you read, whether American or otherwise, talk of a billion as 1000 million.

It is not practical to square the million for a billion, and cube it for trillion, or power 4 for quadrillion, because you get up to unreal numbers very quickly.

Answer 4

4,500,000,000 or 45 followed by 8 zeros (one billion is 9 zeros)

thats an awfully big number

Answer 5

In the USA, 4,500,000,000

in the English world

4,500,000,000,000

Astronomically 4.5 to the 10x12 power

Answer 6

4.5000000000

4 . 5 0 0 0 0 0 0 0 0 0

Four point five billion

Answer 7

4.5 billion out, in numbers?

There.

Answer 8

4,500,000,000 so what's the point?

Answer 9

4,500,000,000

Answer 10

4,500,000,000