Let's divide 87753118 by 521
We want to figure out the number of times 87753118 can be divided by 521.

Step 1:
521 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 521

On to step 2:
87 divided by 521 is 0 with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Grab the next digit (7) from the dividend, add it to 87, then carry on: 877 / 521

Moving on to step 3:
521 can be fit into 877 1 times, resulting in a remainder of 356.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 521 away from 877, we end up with 356.
Append the next digit (5) from the dividend to 356 and continue with: 3565 / 521

Moving on to step 4:
If we divide 3565 by 521, we get 6 and a remainder of 439.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
If we take 3126 away from 3565, we end up with 439.
Take the next digit (3) from the dividend and append it to 439, then repeat: 4393 / 521

Going ahead to step 5:
The number 521 fits into 4393 8 times, leaving a remainder of 225.
Record the quotient 8 as the next digit in the result. 
Result so far: 168.0
The remainder is 225 after subtracting 4168 from 4393.
Include the next digit (1) from the dividend after 225, then repeat: 2251 / 521

Moving on to step 6:
2251 divided by 521 is 4 with a remainder of 167.
Use 4 as the next digit of our solution. 
Result so far: 1684.0
Subtract 2084 from 2251 to get 167.
Include the next digit (1) from the dividend after 167, then repeat: 1671 / 521

Advancing to step 7:
If we divide 1671 by 521, we get 3 and a remainder of 108.
The next digit of our result is 3. 
Result so far: 16843.0
Subtract 1563 from 1671 to get 108.
Bring next digit (8) of the dividend behind the 108 and repeat the process: 1088 / 521

On to step 8:
521 goes into 1088 2 times with a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 168432.0
Subtract 1042 from 1088 to get 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 9:
521 goes into 460 0 times with a remainder of 460.
The next digit of our result is 0. 
Result so far: 168432.0
If we subtract 0 from 460, we get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Advancing to step 10:
521 goes into 4600 8 times with a remainder of 432.
Record the quotient 8 as the next digit in the result. 
Result so far: 168432.08
If we subtract 4168 from 4600, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Step 11:
521 goes into 4320 8 times with a remainder of 152.
Use 8 as the next digit of our solution. 
Result so far: 168432.088
Subtracting 4168 from 4320 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

The final result is 168432.088 with a remainder of 0.0152.