15964 ÷ 9 = 1773 R7
Let's divide 15964 by 9.

Step 1:
9 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 9

Step 2:
9 goes into 15 1 times with a remainder of 6.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 9 from 15 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 9

Step 3:
9 goes into 69 7 times with a remainder of 6.
Write down 7 as next digit of of the result. 
Result so far: 17
Subtract 63 from 69 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 9

Step 4:
9 goes into 66 7 times with a remainder of 3.
Write down 7 as next digit of of the result. 
Result so far: 177
Subtract 63 from 66 to get 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 9

Step 5:
9 goes into 34 3 times with a remainder of 7.
Write down 3 as next digit of of the result. 
Result so far: 1773
Subtract 27 from 34 to get 7.

The final result is 1773 with a remainder of 7.