900
To write "9 hundred million" in numerical form, you would write it as 900,000,000. This is achieved by placing the digit 9 in the hundred million place, followed by eight zeros.
900,000,000
905,000
920
.9 or 9/10ths.
900,003,000,000
.4239
9,200,000,000
49,000,999
9,004,700
9,460,000,000,000
5,065,900