Because anything multiplied by zero is zero. Durr
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Adding the zeros
You move the decimal the amounts of zeros it has to the right. so if the number is 1.8 x 10= you move the decimal one to the right since it has one zero, then you multiply and get 18.0 its easier with a calculator but its still easy :)
In 90 billion, there are 9 zeros. This is because a billion has 9 zeros (1,000,000,000), and when you multiply 90 by a billion, you get 90 billion, which retains the 9 zeros from the billion.
Multiply 4 times 25 to get 100 and then add the two zeros to get 10000
They are 8 times 125 = 1000