638142 ÷ 81 
We want to divide 638142 by 81.

Advancing to step 1:
The number 81 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 81

Going ahead to step 2:
The number 81 fits into 63 0 times, leaving a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Take the next digit (8) from the dividend and append it to 63, then repeat: 638 / 81

Advancing to step 3:
If we divide 638 by 81, we get 7 and a remainder of 71.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 71 after subtracting 567 from 638.
Bring next digit (1) of the dividend behind the 71 and repeat the process: 711 / 81

Moving on to step 4:
81 goes into 711 8 times with a remainder of 63.
Record the quotient 8 as the next digit in the result. 
Result so far: 78.0
The remainder is 63 after subtracting 648 from 711.
Append the next digit (4) from the dividend to 63 and continue with: 634 / 81

On to step 5:
When dividing 634 by 81, we get 7 with a remainder of 67.
Put 7 as the next digit of the answer. 
Result so far: 787.0
If we take 567 away from 634, we end up with 67.
Grab the next digit (2) from the dividend, add it to 67, then carry on: 672 / 81

Advancing to step 6:
81 goes into 672 8 times with a remainder of 24.
Put 8 as the next digit of the answer. 
Result so far: 7878.0
Deduct 648 from 672 and we're left with 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 7:
When dividing 240 by 81, we get 2 with a remainder of 78.
Write down 2 as next digit of the result. 
Result so far: 7878.2
Subtract 162 from 240 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Going ahead to step 8:
When dividing 780 by 81, we get 9 with a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 7878.29
Subtracting 729 from 780 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 9:
The number 81 fits into 510 6 times, leaving a remainder of 24.
The next digit of our result is 6. 
Result so far: 7878.296
Deduct 486 from 510 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 10:
When dividing 240 by 81, we get 2 with a remainder of 78.
The next digit of our result is 2. 
Result so far: 7878.2962
Subtract 162 from 240 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 11:
When dividing 780 by 81, we get 9 with a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 7878.29629
Deduct 729 from 780 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 12:
81 goes into 510 6 times with a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 7878.296296
The remainder is 24 after subtracting 486 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 13:
The number 81 fits into 240 2 times, leaving a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 7878.2962962
If we subtract 162 from 240, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 14:
780 divided by 81 is 9 with a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 7878.29629629
Subtracting 729 from 780 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

After the division, we end up with 7878.29629629 and a remainder of 5.1e-08.