Answer:

306, 936, 405, 504

Step-by-step explanation:

Add each digit of the number and if the sum is a multiple of 9, it is divisible by 9.

9+6 = 15

3+0+6 = 9 ✅

4+5+2 = 11

8+8+6 = 22

3+8+1 = 12

3+6+4 = 13

9+3+6 = 18 ✅

4+0+5 = 9 ✅

5+0+4 = 9 ✅

6+0+3+3 = 12