Let's divide 86665143 by 51
Let's see how many times 51 fits into 86665143.

On to step 1:
51 can be fit into 8 0 times, resulting in 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.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 51

Going ahead to step 2:
When dividing 86 by 51, we get 1 with a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 51 away from 86, we end up with 35.
Append the next digit (6) from the dividend to 35 and continue with: 356 / 51

Let's proceed to step 3:
51 can be fit into 356 6 times, resulting in a remainder of 50.
The next digit of our result is 6. 
Result so far: 16.0
Subtracting 306 from 356 leaves us with 50.
Bring next digit (6) of the dividend behind the 50 and repeat the process: 506 / 51

On to step 4:
If we divide 506 by 51, we get 9 and a remainder of 47.
Put 9 as the next digit of the answer. 
Result so far: 169.0
Subtracting 459 from 506 leaves us with 47.
Take the next digit (5) from the dividend and append it to 47, then repeat: 475 / 51

Going ahead to step 5:
51 goes into 475 9 times with a remainder of 16.
The next digit of our result is 9. 
Result so far: 1699.0
If we subtract 459 from 475, we get 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 51

Going ahead to step 6:
161 divided by 51 is 3 with a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 16993.0
Subtracting 153 from 161 leaves us with 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 51

Advancing to step 7:
If we divide 84 by 51, we get 1 and a remainder of 33.
Put 1 as the next digit of the answer. 
Result so far: 169931.0
If we subtract 51 from 84, we get 33.
Append the next digit (3) from the dividend to 33 and continue with: 333 / 51

Moving on to step 8:
If we divide 333 by 51, we get 6 and a remainder of 27.
Record the quotient 6 as the next digit in the result. 
Result so far: 1699316.0
Deduct 306 from 333 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 9:
51 goes into 270 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 1699316.5
Deduct 255 from 270 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 10:
150 divided by 51 is 2 with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 1699316.52
Subtracting 102 from 150 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 11:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 1699316.529
Subtract 459 from 480 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 12:
51 goes into 210 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 1699316.5294
If we subtract 204 from 210, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 13:
60 divided by 51 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 1699316.52941
Subtract 51 from 60 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
90 divided by 51 is 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 1699316.529411
If we subtract 51 from 90, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

After the division, we end up with 1699316.529411 and a remainder of 3.9e-06.