721921 divided by 87 
We want to figure out the number of times 721921 can be divided by 87.

Going ahead to step 1:
7 divided by 87 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 87

Going ahead to step 2:
When dividing 72 by 87, we get 0 with a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Take the next digit (1) from the dividend and append it to 72, then repeat: 721 / 87

Moving on to step 3:
If we divide 721 by 87, we get 8 and a remainder of 25.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 696 away from 721, we end up with 25.
Include the next digit (9) from the dividend after 25, then repeat: 259 / 87

Going ahead to step 4:
87 can be fit into 259 2 times, resulting in a remainder of 85.
The number 2 becomes the next digit in our result. 
Result so far: 82.0
Subtracting 174 from 259 leaves us with 85.
Append the next digit (2) from the dividend to 85 and continue with: 852 / 87

Let's proceed to step 5:
The number 87 fits into 852 9 times, leaving a remainder of 69.
Write down 9 as next digit of the result. 
Result so far: 829.0
Subtracting 783 from 852 leaves us with 69.
Take the next digit (1) from the dividend and append it to 69, then repeat: 691 / 87

Step 6:
87 can be fit into 691 7 times, resulting in a remainder of 82.
Write down 7 as next digit of the result. 
Result so far: 8297.0
Deduct 609 from 691 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 7:
87 can be fit into 820 9 times, resulting in a remainder of 37.
Record the quotient 9 as the next digit in the result. 
Result so far: 8297.9
If we subtract 783 from 820, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 8:
87 can be fit into 370 4 times, resulting in a remainder of 22.
The next digit of our result is 4. 
Result so far: 8297.94
Deduct 348 from 370 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 9:
87 goes into 220 2 times with a remainder of 46.
Write down 2 as next digit of the result. 
Result so far: 8297.942
Deduct 174 from 220 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 10:
460 divided by 87 is 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 8297.9425
Deduct 435 from 460 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 11:
The number 87 fits into 250 2 times, leaving a remainder of 76.
The number 2 becomes the next digit in our result. 
Result so far: 8297.94252
The remainder is 76 after subtracting 174 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 12:
87 goes into 760 8 times with a remainder of 64.
The number 8 becomes the next digit in our result. 
Result so far: 8297.942528
The remainder is 64 after subtracting 696 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 13:
The number 87 fits into 640 7 times, leaving a remainder of 31.
Use 7 as the next digit of our solution. 
Result so far: 8297.9425287
If we take 609 away from 640, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 14:
When dividing 310 by 87, we get 3 with a remainder of 49.
Put 3 as the next digit of the answer. 
Result so far: 8297.94252873
If we take 261 away from 310, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

The final outcome is 8297.94252873, with a leftover of 4.9e-08.