We're dividing 89810050 by 521 
The aim is to understand the frequency of 521 in 89810050.

Step 1:
8 divided by 521 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 521

Advancing to step 2:
If we divide 89 by 521, we get 0 and a remainder of 89.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 89, we end up with 89.
Take the next digit (8) from the dividend and append it to 89, then repeat: 898 / 521

Going ahead to step 3:
898 divided by 521 is 1 with a remainder of 377.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 521 from 898 and we're left with 377.
Take the next digit (1) from the dividend and append it to 377, then repeat: 3771 / 521

Advancing to step 4:
If we divide 3771 by 521, we get 7 and a remainder of 124.
Write down 7 as next digit of the result. 
Result so far: 17.0
The remainder is 124 after subtracting 3647 from 3771.
Fetch the next digit (0) from the dividend, attach it to 124 and continue: 1240 / 521

On to step 5:
The number 521 fits into 1240 2 times, leaving a remainder of 198.
Put 2 as the next digit of the answer. 
Result so far: 172.0
If we take 1042 away from 1240, we end up with 198.
Include the next digit (0) from the dividend after 198, then repeat: 1980 / 521

Advancing to step 6:
1980 divided by 521 is 3 with a remainder of 417.
Write down 3 as next digit of the result. 
Result so far: 1723.0
Subtracting 1563 from 1980 leaves us with 417.
Include the next digit (5) from the dividend after 417, then repeat: 4175 / 521

Advancing to step 7:
If we divide 4175 by 521, we get 8 and a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 17238.0
If we take 4168 away from 4175, we end up with 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 521

Step 8:
When dividing 70 by 521, we get 0 with a remainder of 70.
The next digit of our result is 0. 
Result so far: 172380.0
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 9:
521 can be fit into 700 1 times, resulting in a remainder of 179.
Record the quotient 1 as the next digit in the result. 
Result so far: 172380.1
The remainder is 179 after subtracting 521 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Moving on to step 10:
If we divide 1790 by 521, we get 3 and a remainder of 227.
Record the quotient 3 as the next digit in the result. 
Result so far: 172380.13
The remainder is 227 after subtracting 1563 from 1790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Going ahead to step 11:
If we divide 2270 by 521, we get 4 and a remainder of 186.
Write down 4 as next digit of the result. 
Result so far: 172380.134
The remainder is 186 after subtracting 2084 from 2270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Moving on to step 12:
1860 divided by 521 is 3 with a remainder of 297.
The number 3 becomes the next digit in our result. 
Result so far: 172380.1343
If we subtract 1563 from 1860, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Going ahead to step 13:
The number 521 fits into 2970 5 times, leaving a remainder of 365.
Put 5 as the next digit of the answer. 
Result so far: 172380.13435
Subtract 2605 from 2970 to get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Advancing to step 14:
The number 521 fits into 3650 7 times, leaving a remainder of 3.
The next digit of our result is 7. 
Result so far: 172380.134357
If we take 3647 away from 3650, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 15:
521 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 172380.134357
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 16:
The number 521 fits into 300 0 times, leaving a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 172380.134357
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The quotient of the division is 172380.134357, and the remainder is 3e-07.