39879090 ÷ 406 
Our goal is to divide 39879090 by 406.

Advancing to step 1:
406 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 406

On to step 2:
When dividing 39 by 406, we get 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 406

Step 3:
406 goes into 398 0 times with a remainder of 398.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 398, we get 398.
Fetch the next digit (7) from the dividend, attach it to 398 and continue: 3987 / 406

Advancing to step 4:
406 can be fit into 3987 9 times, resulting in a remainder of 333.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 3654 from 3987 to get 333.
Grab the next digit (9) from the dividend, add it to 333, then carry on: 3339 / 406

Advancing to step 5:
406 can be fit into 3339 8 times, resulting in a remainder of 91.
Record the quotient 8 as the next digit in the result. 
Result so far: 98.0
Subtract 3248 from 3339 to get 91.
Append the next digit (0) from the dividend to 91 and continue with: 910 / 406

Advancing to step 6:
The number 406 fits into 910 2 times, leaving a remainder of 98.
The number 2 becomes the next digit in our result. 
Result so far: 982.0
If we subtract 812 from 910, we get 98.
Take the next digit (9) from the dividend and append it to 98, then repeat: 989 / 406

On to step 7:
If we divide 989 by 406, we get 2 and a remainder of 177.
The next digit of our result is 2. 
Result so far: 9822.0
The remainder is 177 after subtracting 812 from 989.
Include the next digit (0) from the dividend after 177, then repeat: 1770 / 406

Let's proceed to step 8:
When dividing 1770 by 406, we get 4 with a remainder of 146.
Put 4 as the next digit of the answer. 
Result so far: 98224.0
Subtracting 1624 from 1770 leaves us with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Let's proceed to step 9:
406 goes into 1460 3 times with a remainder of 242.
Write down 3 as next digit of the result. 
Result so far: 98224.3
Deduct 1218 from 1460 and we're left with 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Step 10:
406 can be fit into 2420 5 times, resulting in a remainder of 390.
Record the quotient 5 as the next digit in the result. 
Result so far: 98224.35
Deduct 2030 from 2420 and we're left with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

On to step 11:
If we divide 3900 by 406, we get 9 and a remainder of 246.
Use 9 as the next digit of our solution. 
Result so far: 98224.359
Subtract 3654 from 3900 to get 246.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2460, and continue the process.

Moving on to step 12:
The number 406 fits into 2460 6 times, leaving a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 98224.3596
Subtract 2436 from 2460 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 13:
If we divide 240 by 406, we get 0 and a remainder of 240.
Put 0 as the next digit of the answer. 
Result so far: 98224.3596
Subtracting 0 from 240 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 14:
406 goes into 2400 5 times with a remainder of 370.
Record the quotient 5 as the next digit in the result. 
Result so far: 98224.359605
Subtract 2030 from 2400 to get 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 15:
406 goes into 3700 9 times with a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 98224.3596059
If we subtract 3654 from 3700, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 16:
406 goes into 460 1 times with a remainder of 54.
Write down 1 as next digit of the result. 
Result so far: 98224.35960591
If we take 406 away from 460, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

After the division, we end up with 98224.35960591 and a remainder of 5.4e-08.