We're dividing 870639 by 84 
Let's see how many times 84 fits into 870639.

Going ahead to step 1:
8 divided by 84 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 84

Going ahead to step 2:
84 can be fit into 87 1 times, resulting in a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 3 after subtracting 84 from 87.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 84

Let's proceed to step 3:
The number 84 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 30, we end up with 30.
Fetch the next digit (6) from the dividend, attach it to 30 and continue: 306 / 84

Going ahead to step 4:
306 divided by 84 is 3 with a remainder of 54.
Put 3 as the next digit of the answer. 
Result so far: 103.0
If we subtract 252 from 306, we get 54.
Include the next digit (3) from the dividend after 54, then repeat: 543 / 84

Moving on to step 5:
If we divide 543 by 84, we get 6 and a remainder of 39.
Put 6 as the next digit of the answer. 
Result so far: 1036.0
Deduct 504 from 543 and we're left with 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 84

On to step 6:
The number 84 fits into 399 4 times, leaving a remainder of 63.
The next digit of our result is 4. 
Result so far: 10364.0
Deduct 336 from 399 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 7:
When dividing 630 by 84, we get 7 with a remainder of 42.
Use 7 as the next digit of our solution. 
Result so far: 10364.7
Deduct 588 from 630 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 8:
84 goes into 420 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 10364.75
Deduct 420 from 420 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.

Advancing to step 9:
When dividing 0 by 84, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10364.75
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.

On to step 10:
84 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10364.75
If we take 0 away from 0, we end up 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.

Our division results in 10364.75 with a remaining 0.0.