39917911 ÷ 661 
We want to divide 39917911 by 661.

Moving on to step 1:
If we divide 3 by 661, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 661

Moving on to step 2:
If we divide 39 by 661, we get 0 and a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 661

Moving on to step 3:
The number 661 fits into 399 0 times, leaving a remainder of 399.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 399, we get 399.
Bring next digit (1) of the dividend behind the 399 and repeat the process: 3991 / 661

Advancing to step 4:
661 can be fit into 3991 6 times, resulting in a remainder of 25.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 3966 from 3991 to get 25.
Include the next digit (7) from the dividend after 25, then repeat: 257 / 661

Advancing to step 5:
When dividing 257 by 661, we get 0 with a remainder of 257.
The number 0 becomes the next digit in our result. 
Result so far: 60.0
Deduct 0 from 257 and we're left with 257.
Fetch the next digit (9) from the dividend, attach it to 257 and continue: 2579 / 661

Advancing to step 6:
The number 661 fits into 2579 3 times, leaving a remainder of 596.
Use 3 as the next digit of our solution. 
Result so far: 603.0
If we subtract 1983 from 2579, we get 596.
Bring next digit (1) of the dividend behind the 596 and repeat the process: 5961 / 661

Advancing to step 7:
5961 divided by 661 is 9 with a remainder of 12.
The number 9 becomes the next digit in our result. 
Result so far: 6039.0
If we subtract 5949 from 5961, we get 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 661

Moving on to step 8:
661 can be fit into 121 0 times, resulting in a remainder of 121.
The number 0 becomes the next digit in our result. 
Result so far: 60390.0
The remainder is 121 after subtracting 0 from 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Going ahead to step 9:
661 can be fit into 1210 1 times, resulting in a remainder of 549.
Use 1 as the next digit of our solution. 
Result so far: 60390.1
Subtracting 661 from 1210 leaves us with 549.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5490, and continue the process.

Moving on to step 10:
661 goes into 5490 8 times with a remainder of 202.
Write down 8 as next digit of the result. 
Result so far: 60390.18
Subtracting 5288 from 5490 leaves us with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Going ahead to step 11:
When dividing 2020 by 661, we get 3 with a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 60390.183
If we take 1983 away from 2020, 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.

Going ahead to step 12:
When dividing 370 by 661, we get 0 with a remainder of 370.
Put 0 as the next digit of the answer. 
Result so far: 60390.183
Deduct 0 from 370 and we're left with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Moving on to step 13:
661 goes into 3700 5 times with a remainder of 395.
The next digit of our result is 5. 
Result so far: 60390.18305
If we subtract 3305 from 3700, we get 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

Let's proceed to step 14:
661 can be fit into 3950 5 times, resulting in a remainder of 645.
Put 5 as the next digit of the answer. 
Result so far: 60390.183055
The remainder is 645 after subtracting 3305 from 3950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

In conclusion, the division gives 60390.183055 with a balance of 6.45e-05.