9
5/9 (or 5:9)
9
5/9 divided by 1/2 = 5/9 * 2 = 10/9 or 1 1/9
9
5/9 ÷ 5 = 1/9
1.8
-x divided by -5 is x/5.
A prime number is a number that can only be divided by 1 and itself. While 5 can only be divided by 1 and 5, 9 can be divided by 1, 9 and 3. So 9 is not a prime number, 5 is.
9+4+5=18 which can be divided by 9 so 945 can be divided by nine.
5 / 1/9 = 45
180 divided by 9 is 20. 20 divided by 5 is 4.