We're dividing 90525521 by 403 
The aim is to understand the frequency of 403 in 90525521.

Step 1:
The number 403 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 403

Let's proceed to step 2:
When dividing 90 by 403, we get 0 with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Append the next digit (5) from the dividend to 90 and continue with: 905 / 403

On to step 3:
The number 403 fits into 905 2 times, leaving a remainder of 99.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 806 from 905 and we're left with 99.
Append the next digit (2) from the dividend to 99 and continue with: 992 / 403

Step 4:
When dividing 992 by 403, we get 2 with a remainder of 186.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
The remainder is 186 after subtracting 806 from 992.
Grab the next digit (5) from the dividend, add it to 186, then carry on: 1865 / 403

Step 5:
403 goes into 1865 4 times with a remainder of 253.
Use 4 as the next digit of our solution. 
Result so far: 224.0
The remainder is 253 after subtracting 1612 from 1865.
Include the next digit (5) from the dividend after 253, then repeat: 2535 / 403

Let's proceed to step 6:
403 goes into 2535 6 times with a remainder of 117.
Use 6 as the next digit of our solution. 
Result so far: 2246.0
If we take 2418 away from 2535, we end up with 117.
Append the next digit (2) from the dividend to 117 and continue with: 1172 / 403

Moving on to step 7:
The number 403 fits into 1172 2 times, leaving a remainder of 366.
The number 2 becomes the next digit in our result. 
Result so far: 22462.0
Subtract 806 from 1172 to get 366.
Bring next digit (1) of the dividend behind the 366 and repeat the process: 3661 / 403

Going ahead to step 8:
The number 403 fits into 3661 9 times, leaving a remainder of 34.
Use 9 as the next digit of our solution. 
Result so far: 224629.0
Subtract 3627 from 3661 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 9:
If we divide 340 by 403, we get 0 and a remainder of 340.
Write down 0 as next digit of the result. 
Result so far: 224629.0
If we subtract 0 from 340, we get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 10:
3400 divided by 403 is 8 with a remainder of 176.
The number 8 becomes the next digit in our result. 
Result so far: 224629.08
The remainder is 176 after subtracting 3224 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Moving on to step 11:
403 can be fit into 1760 4 times, resulting in a remainder of 148.
Use 4 as the next digit of our solution. 
Result so far: 224629.084
If we take 1612 away from 1760, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Going ahead to step 12:
403 can be fit into 1480 3 times, resulting in a remainder of 271.
Put 3 as the next digit of the answer. 
Result so far: 224629.0843
Subtracting 1209 from 1480 leaves us with 271.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

Going ahead to step 13:
403 can be fit into 2710 6 times, resulting in a remainder of 292.
Put 6 as the next digit of the answer. 
Result so far: 224629.08436
Deduct 2418 from 2710 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

On to step 14:
2920 divided by 403 is 7 with a remainder of 99.
Write down 7 as next digit of the result. 
Result so far: 224629.084367
Deduct 2821 from 2920 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Advancing to step 15:
The number 403 fits into 990 2 times, leaving a remainder of 184.
Put 2 as the next digit of the answer. 
Result so far: 224629.0843672
If we take 806 away from 990, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

On to step 16:
403 goes into 1840 4 times with a remainder of 228.
Use 4 as the next digit of our solution. 
Result so far: 224629.08436724
If we take 1612 away from 1840, we end up with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

The quotient of the division is 224629.08436724, and the remainder is 2.28e-07.