This is very easy. Since 10 billion is three orders higher than 10 million, we can write this as:
(10^10) / (10^7) = 10^(10-7) = 10^3 = 1000
Think about it. Each 1000 represents a higher-valued prefix.
Thousand is the base 0.
Mil-lion is the base 1.
Bil-lion is the base 2.
Tril-lion is the base 3.
Quadril-lion is the base 4.
... and so on.
In other words, a billion is only one value higher than a million, so 2 - 1 = 1
and (1000^1) = 1000
If the number had been a trillion, we would have calculated this as: 3 - 1 = 2
and (1000^2) = 1,000,000
10 billion divided by 10 million is 1,000.
10
0.127
10
5
1 Billion/10 = 100 Million.
0.125
0.1538
10
0.01
1
0.01