85639978 ÷ 639 
We want to divide 85639978 by 639.

Let's proceed to step 1:
When dividing 8 by 639, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 639

Let's proceed to step 2:
When dividing 85 by 639, we get 0 with a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Include the next digit (6) from the dividend after 85, then repeat: 856 / 639

On to step 3:
639 can be fit into 856 1 times, resulting in a remainder of 217.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 639 from 856 leaves us with 217.
Append the next digit (3) from the dividend to 217 and continue with: 2173 / 639

Going ahead to step 4:
639 can be fit into 2173 3 times, resulting in a remainder of 256.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtract 1917 from 2173 to get 256.
Grab the next digit (9) from the dividend, add it to 256, then carry on: 2569 / 639

Going ahead to step 5:
When dividing 2569 by 639, we get 4 with a remainder of 13.
Record the quotient 4 as the next digit in the result. 
Result so far: 134.0
Subtract 2556 from 2569 to get 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 639

Moving on to step 6:
139 divided by 639 is 0 with a remainder of 139.
Write down 0 as next digit of the result. 
Result so far: 1340.0
Subtracting 0 from 139 leaves us with 139.
Grab the next digit (7) from the dividend, add it to 139, then carry on: 1397 / 639

Let's proceed to step 7:
The number 639 fits into 1397 2 times, leaving a remainder of 119.
Record the quotient 2 as the next digit in the result. 
Result so far: 13402.0
The remainder is 119 after subtracting 1278 from 1397.
Take the next digit (8) from the dividend and append it to 119, then repeat: 1198 / 639

Advancing to step 8:
639 goes into 1198 1 times with a remainder of 559.
Use 1 as the next digit of our solution. 
Result so far: 134021.0
Deduct 639 from 1198 and we're left with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

On to step 9:
When dividing 5590 by 639, we get 8 with a remainder of 478.
Write down 8 as next digit of the result. 
Result so far: 134021.8
Subtract 5112 from 5590 to get 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Moving on to step 10:
4780 divided by 639 is 7 with a remainder of 307.
Record the quotient 7 as the next digit in the result. 
Result so far: 134021.87
If we subtract 4473 from 4780, we get 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Advancing to step 11:
The number 639 fits into 3070 4 times, leaving a remainder of 514.
Record the quotient 4 as the next digit in the result. 
Result so far: 134021.874
Deduct 2556 from 3070 and we're left with 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

Going ahead to step 12:
If we divide 5140 by 639, we get 8 and a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 134021.8748
Deduct 5112 from 5140 and we're left 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.

Step 13:
639 goes into 280 0 times with a remainder of 280.
The number 0 becomes the next digit in our result. 
Result so far: 134021.8748
Subtract 0 from 280 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 14:
2800 divided by 639 is 4 with a remainder of 244.
Put 4 as the next digit of the answer. 
Result so far: 134021.874804
Subtracting 2556 from 2800 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Going ahead to step 15:
The number 639 fits into 2440 3 times, leaving a remainder of 523.
The number 3 becomes the next digit in our result. 
Result so far: 134021.8748043
Deduct 1917 from 2440 and we're left with 523.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5230, and continue the process.

Moving on to step 16:
5230 divided by 639 is 8 with a remainder of 118.
Write down 8 as next digit of the result. 
Result so far: 134021.87480438
Subtracting 5112 from 5230 leaves us with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

The quotient of the division is 134021.87480438, and the remainder is 1.18e-07.