521990 ÷ 87 
We want to divide 521990 by 87.

Going ahead to step 1:
5 divided by 87 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 87

Going ahead to step 2:
The number 87 fits into 52 0 times, leaving a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 52 and we're left with 52.
Take the next digit (1) from the dividend and append it to 52, then repeat: 521 / 87

Going ahead to step 3:
87 goes into 521 5 times with a remainder of 86.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 435 away from 521, we end up with 86.
Take the next digit (9) from the dividend and append it to 86, then repeat: 869 / 87

Let's proceed to step 4:
87 goes into 869 9 times with a remainder of 86.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
If we take 783 away from 869, we end up with 86.
Bring next digit (9) of the dividend behind the 86 and repeat the process: 869 / 87

Let's proceed to step 5:
The number 87 fits into 869 9 times, leaving a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 599.0
If we subtract 783 from 869, we get 86.
Grab the next digit (0) from the dividend, add it to 86, then carry on: 860 / 87

Moving on to step 6:
When dividing 860 by 87, we get 9 with a remainder of 77.
The number 9 becomes the next digit in our result. 
Result so far: 5999.0
Subtract 783 from 860 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Advancing to step 7:
When dividing 770 by 87, we get 8 with a remainder of 74.
The number 8 becomes the next digit in our result. 
Result so far: 5999.8
Deduct 696 from 770 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 8:
87 goes into 740 8 times with a remainder of 44.
Use 8 as the next digit of our solution. 
Result so far: 5999.88
Deduct 696 from 740 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

In conclusion, the division gives 5999.88 with a balance of 0.044.