660691 divided by 39 
Let's see how many times 39 fits into 660691.

Going ahead to step 1:
39 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 39

Advancing to step 2:
If we divide 66 by 39, we get 1 and a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 39 from 66 and we're left with 27.
Append the next digit (0) from the dividend to 27 and continue with: 270 / 39

On to step 3:
39 can be fit into 270 6 times, resulting in a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 234 from 270 leaves us with 36.
Include the next digit (6) from the dividend after 36, then repeat: 366 / 39

Advancing to step 4:
39 goes into 366 9 times with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 169.0
Subtracting 351 from 366 leaves us with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 39

Going ahead to step 5:
39 goes into 159 4 times with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 1694.0
Subtracting 156 from 159 leaves us with 3.
Grab the next digit (1) from the dividend, add it to 3, then carry on: 31 / 39

Advancing to step 6:
39 goes into 31 0 times with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 16940.0
If we subtract 0 from 31, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 7:
39 can be fit into 310 7 times, resulting in a remainder of 37.
Put 7 as the next digit of the answer. 
Result so far: 16940.7
If we subtract 273 from 310, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 8:
39 can be fit into 370 9 times, resulting in a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 16940.79
If we take 351 away from 370, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 9:
If we divide 190 by 39, we get 4 and a remainder of 34.
The next digit of our result is 4. 
Result so far: 16940.794
If we subtract 156 from 190, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 10:
When dividing 340 by 39, we get 8 with a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 16940.7948
If we take 312 away from 340, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 11:
280 divided by 39 is 7 with a remainder of 7.
The next digit of our result is 7. 
Result so far: 16940.79487
If we take 273 away from 280, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 12:
70 divided by 39 is 1 with a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 16940.794871
If we take 39 away from 70, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 13:
When dividing 310 by 39, we get 7 with a remainder of 37.
Write down 7 as next digit of the result. 
Result so far: 16940.7948717
If we take 273 away from 310, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 14:
39 can be fit into 370 9 times, resulting in a remainder of 19.
Write down 9 as next digit of the result. 
Result so far: 16940.79487179
Subtract 351 from 370 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

After the division, we end up with 16940.79487179 and a remainder of 1.9e-08.