We look at the division of 10521 by 63 
We want to divide 10521 by 63.

Step 1:
When dividing 1 by 63, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 63

Advancing to step 2:
The number 63 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 63

Advancing to step 3:
When dividing 105 by 63, we get 1 with a remainder of 42.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 42 after subtracting 63 from 105.
Fetch the next digit (2) from the dividend, attach it to 42 and continue: 422 / 63

Moving on to step 4:
If we divide 422 by 63, we get 6 and a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
The remainder is 44 after subtracting 378 from 422.
Append the next digit (1) from the dividend to 44 and continue with: 441 / 63

Step 5:
The number 63 fits into 441 7 times, leaving a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 167.0
If we subtract 441 from 441, we 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.

Advancing to step 6:
63 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 167.0
The remainder is 0 after subtracting 0 from 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 7:
The number 63 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 167.0
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.

In conclusion, the division gives 167.0 with a balance of 0.0.