Because dividing by a fraction has the same effect as multiplying by its reciprocal. In this case 909 is multiplied by 100/9, (0.09 being 9/100)
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0.001
909/2 = 454.5
The sum of 431 plus 478 is 909. This is because when adding two numbers together, you combine the digits in each place value (ones, tens, hundreds, etc.). In this case, 1 + 8 equals 9 in the ones place, 3 + 7 equals 10 (carry-over 1 to the tens place), and 4 + 4 equals 8 in the hundreds place.
909 written in roman numeral is CMIX
Not a prime number, as for example it can be divided by 9 101 x 9 = 909