39711872 ÷ 661 
We want to figure out the number of times 39711872 can be divided by 661.

Step 1:
661 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 661

Going ahead to step 2:
661 goes into 39 0 times with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (7) from the dividend after 39, then repeat: 397 / 661

Moving on to step 3:
661 can be fit into 397 0 times, resulting in a remainder of 397.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 397 and we're left with 397.
Include the next digit (1) from the dividend after 397, then repeat: 3971 / 661

Advancing to step 4:
The number 661 fits into 3971 6 times, leaving a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 3966 from 3971 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 661

Going ahead to step 5:
If we divide 51 by 661, we get 0 and a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 60.0
If we take 0 away from 51, we end up with 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 661

Going ahead to step 6:
661 goes into 518 0 times with a remainder of 518.
The number 0 becomes the next digit in our result. 
Result so far: 600.0
The remainder is 518 after subtracting 0 from 518.
Append the next digit (7) from the dividend to 518 and continue with: 5187 / 661

Let's proceed to step 7:
5187 divided by 661 is 7 with a remainder of 560.
Record the quotient 7 as the next digit in the result. 
Result so far: 6007.0
Deduct 4627 from 5187 and we're left with 560.
Grab the next digit (2) from the dividend, add it to 560, then carry on: 5602 / 661

Advancing to step 8:
5602 divided by 661 is 8 with a remainder of 314.
Put 8 as the next digit of the answer. 
Result so far: 60078.0
If we take 5288 away from 5602, we end up with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 9:
661 can be fit into 3140 4 times, resulting in a remainder of 496.
Put 4 as the next digit of the answer. 
Result so far: 60078.4
Deduct 2644 from 3140 and we're left with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Step 10:
The number 661 fits into 4960 7 times, leaving a remainder of 333.
Put 7 as the next digit of the answer. 
Result so far: 60078.47
Subtract 4627 from 4960 to get 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Advancing to step 11:
When dividing 3330 by 661, we get 5 with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 60078.475
Deduct 3305 from 3330 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 12:
The number 661 fits into 250 0 times, leaving a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 60078.475
If we subtract 0 from 250, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 13:
The number 661 fits into 2500 3 times, leaving a remainder of 517.
Put 3 as the next digit of the answer. 
Result so far: 60078.47503
Subtracting 1983 from 2500 leaves us with 517.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5170, and continue the process.

Advancing to step 14:
If we divide 5170 by 661, we get 7 and a remainder of 543.
Put 7 as the next digit of the answer. 
Result so far: 60078.475037
Subtracting 4627 from 5170 leaves us with 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

Let's proceed to step 15:
661 can be fit into 5430 8 times, resulting in a remainder of 142.
Put 8 as the next digit of the answer. 
Result so far: 60078.4750378
Subtract 5288 from 5430 to get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 16:
If we divide 1420 by 661, we get 2 and a remainder of 98.
Use 2 as the next digit of our solution. 
Result so far: 60078.47503782
If we take 1322 away from 1420, we end up with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

After the division, we end up with 60078.47503782 and a remainder of 9.8e-08.