We divide 129421 by 85
We're looking to find how many times 85 goes into 129421.

Advancing to step 1:
85 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 85

Advancing to step 2:
When dividing 12 by 85, we get 0 with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 85

Step 3:
If we divide 129 by 85, we get 1 and a remainder of 44.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 85 from 129 leaves us with 44.
Fetch the next digit (4) from the dividend, attach it to 44 and continue: 444 / 85

On to step 4:
If we divide 444 by 85, we get 5 and a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtract 425 from 444 to get 19.
Take the next digit (2) from the dividend and append it to 19, then repeat: 192 / 85

On to step 5:
The number 85 fits into 192 2 times, leaving a remainder of 22.
Write down 2 as next digit of the result. 
Result so far: 152.0
Subtract 170 from 192 to get 22.
Bring next digit (1) of the dividend behind the 22 and repeat the process: 221 / 85

Moving on to step 6:
When dividing 221 by 85, we get 2 with a remainder of 51.
Record the quotient 2 as the next digit in the result. 
Result so far: 1522.0
If we take 170 away from 221, we end up 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.

On to step 7:
85 can be fit into 510 6 times, resulting in a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 1522.6
The remainder is 0 after subtracting 510 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
85 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1522.6
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 85, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1522.6
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 1522.6 with a remaining 0.0.