661523 ÷ 39 
We want to figure out the number of times 661523 can be divided by 39.

Let's proceed to step 1:
39 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 39

Going ahead to step 2:
39 can be fit into 66 1 times, resulting in a remainder of 27.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 39 from 66 and we're left with 27.
Append the next digit (1) from the dividend to 27 and continue with: 271 / 39

Advancing to step 3:
39 can be fit into 271 6 times, resulting in a remainder of 37.
The next digit of our result is 6. 
Result so far: 16.0
If we subtract 234 from 271, we get 37.
Fetch the next digit (5) from the dividend, attach it to 37 and continue: 375 / 39

Moving on to step 4:
375 divided by 39 is 9 with a remainder of 24.
Write down 9 as next digit of the result. 
Result so far: 169.0
Subtracting 351 from 375 leaves us with 24.
Grab the next digit (2) from the dividend, add it to 24, then carry on: 242 / 39

Moving on to step 5:
The number 39 fits into 242 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 1696.0
Subtracting 234 from 242 leaves us with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 39

Moving on to step 6:
39 can be fit into 83 2 times, resulting in a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 16962.0
Subtract 78 from 83 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
39 can be fit into 50 1 times, resulting in a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 16962.1
Deduct 39 from 50 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 8:
39 goes into 110 2 times with a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 16962.12
The remainder is 32 after subtracting 78 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 9:
The number 39 fits into 320 8 times, leaving a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 16962.128
Subtracting 312 from 320 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
80 divided by 39 is 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 16962.1282
If we subtract 78 from 80, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
39 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 16962.1282
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
When dividing 200 by 39, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 16962.128205
Subtracting 195 from 200 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
39 goes into 50 1 times with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 16962.1282051
If we subtract 39 from 50, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
39 can be fit into 110 2 times, resulting in a remainder of 32.
Record the quotient 2 as the next digit in the result. 
Result so far: 16962.12820512
If we subtract 78 from 110, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 16962.12820512 and a remainder of 3.2e-08.