Answer:
Since, Multiplication is a shortcut for addition.
Use of Distributive Property is the most familiar alternative way to write 9 x 200.
Distributive Property states that when a number is multiplied by the sum of two numbers, then the first number can be distributed to both of those numbers and multiplied by each of them separately i.e,

9 x 200
First replace 200 as 100+100 then, we have

Now, using distributive property above:
9 x 200 =
= 900+900 =1800.