Let's divide 86691571 by 138
We want to divide 86691571 by 138.

Step 1:
138 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 138

Going ahead to step 2:
The number 138 fits into 86 0 times, leaving a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Bring next digit (6) of the dividend behind the 86 and repeat the process: 866 / 138

Let's proceed to step 3:
866 divided by 138 is 6 with a remainder of 38.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 828 from 866 leaves us with 38.
Append the next digit (9) from the dividend to 38 and continue with: 389 / 138

Step 4:
When dividing 389 by 138, we get 2 with a remainder of 113.
The next digit of our result is 2. 
Result so far: 62.0
Subtracting 276 from 389 leaves us with 113.
Fetch the next digit (1) from the dividend, attach it to 113 and continue: 1131 / 138

Going ahead to step 5:
When dividing 1131 by 138, we get 8 with a remainder of 27.
Use 8 as the next digit of our solution. 
Result so far: 628.0
If we subtract 1104 from 1131, we get 27.
Include the next digit (5) from the dividend after 27, then repeat: 275 / 138

Step 6:
138 can be fit into 275 1 times, resulting in a remainder of 137.
Put 1 as the next digit of the answer. 
Result so far: 6281.0
If we subtract 138 from 275, we get 137.
Bring next digit (7) of the dividend behind the 137 and repeat the process: 1377 / 138

Moving on to step 7:
138 can be fit into 1377 9 times, resulting in a remainder of 135.
The next digit of our result is 9. 
Result so far: 62819.0
Deduct 1242 from 1377 and we're left with 135.
Append the next digit (1) from the dividend to 135 and continue with: 1351 / 138

Step 8:
If we divide 1351 by 138, we get 9 and a remainder of 109.
Record the quotient 9 as the next digit in the result. 
Result so far: 628199.0
Subtracting 1242 from 1351 leaves us with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Moving on to step 9:
When dividing 1090 by 138, we get 7 with a remainder of 124.
Use 7 as the next digit of our solution. 
Result so far: 628199.7
If we take 966 away from 1090, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 10:
If we divide 1240 by 138, we get 8 and a remainder of 136.
The number 8 becomes the next digit in our result. 
Result so far: 628199.78
If we subtract 1104 from 1240, we get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Moving on to step 11:
If we divide 1360 by 138, we get 9 and a remainder of 118.
Use 9 as the next digit of our solution. 
Result so far: 628199.789
The remainder is 118 after subtracting 1242 from 1360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

On to step 12:
When dividing 1180 by 138, we get 8 with a remainder of 76.
The next digit of our result is 8. 
Result so far: 628199.7898
If we take 1104 away from 1180, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 13:
138 can be fit into 760 5 times, resulting in a remainder of 70.
Record the quotient 5 as the next digit in the result. 
Result so far: 628199.78985
Deduct 690 from 760 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 14:
138 can be fit into 700 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 628199.789855
Deduct 690 from 700 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 628199.789855 with a balance of 1e-06.