Which decimal number is equivalent to 9/1000?

0.009

0.18

0.9

0.0009

0.009 is the answer. You have to move the decimal to the left 3 places because there are 3 zeroes in 1000.

For example:

9/100=0.09 (You move the decimal 2 places because there are 2 zeroes in 100)

9/10000=0.0009

9/10=0.9