666121 ÷ 85 
We want to divide 666121 by 85.

On to step 1:
When dividing 6 by 85, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 85

Going ahead to step 2:
66 divided by 85 is 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (6) from the dividend after 66, then repeat: 666 / 85

Let's proceed to step 3:
When dividing 666 by 85, we get 7 with a remainder of 71.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
The remainder is 71 after subtracting 595 from 666.
Fetch the next digit (1) from the dividend, attach it to 71 and continue: 711 / 85

Going ahead to step 4:
If we divide 711 by 85, we get 8 and a remainder of 31.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
The remainder is 31 after subtracting 680 from 711.
Append the next digit (2) from the dividend to 31 and continue with: 312 / 85

Advancing to step 5:
When dividing 312 by 85, we get 3 with a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 783.0
The remainder is 57 after subtracting 255 from 312.
Fetch the next digit (1) from the dividend, attach it to 57 and continue: 571 / 85

On to step 6:
When dividing 571 by 85, we get 6 with a remainder of 61.
Write down 6 as next digit of the result. 
Result so far: 7836.0
If we take 510 away from 571, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 7:
If we divide 610 by 85, we get 7 and a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 7836.7
The remainder is 15 after subtracting 595 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
85 goes into 150 1 times with a remainder of 65.
The next digit of our result is 1. 
Result so far: 7836.71
Deduct 85 from 150 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 9:
85 can be fit into 650 7 times, resulting in a remainder of 55.
Put 7 as the next digit of the answer. 
Result so far: 7836.717
Subtracting 595 from 650 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 10:
550 divided by 85 is 6 with a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 7836.7176
Subtract 510 from 550 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
If we divide 400 by 85, we get 4 and a remainder of 60.
Record the quotient 4 as the next digit in the result. 
Result so far: 7836.71764
Subtracting 340 from 400 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 12:
The number 85 fits into 600 7 times, leaving a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 7836.717647
The remainder is 5 after subtracting 595 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 13:
50 divided by 85 is 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 7836.717647
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 14:
85 goes into 500 5 times with a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 7836.71764705
Deduct 425 from 500 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

The final result is 7836.71764705 with a remainder of 7.5e-08.