We look at the division of 90453320 by 810 
The aim is to understand the frequency of 810 in 90453320.

Step 1:
If we divide 9 by 810, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 810

Advancing to step 2:
When dividing 90 by 810, we get 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Fetch the next digit (4) from the dividend, attach it to 90 and continue: 904 / 810

Advancing to step 3:
904 divided by 810 is 1 with a remainder of 94.
The next digit of our result is 1. 
Result so far: 1.0
If we take 810 away from 904, we end up with 94.
Bring next digit (5) of the dividend behind the 94 and repeat the process: 945 / 810

Moving on to step 4:
When dividing 945 by 810, we get 1 with a remainder of 135.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we subtract 810 from 945, we get 135.
Take the next digit (3) from the dividend and append it to 135, then repeat: 1353 / 810

Going ahead to step 5:
If we divide 1353 by 810, we get 1 and a remainder of 543.
The number 1 becomes the next digit in our result. 
Result so far: 111.0
Subtract 810 from 1353 to get 543.
Take the next digit (3) from the dividend and append it to 543, then repeat: 5433 / 810

Let's proceed to step 6:
5433 divided by 810 is 6 with a remainder of 573.
The next digit of our result is 6. 
Result so far: 1116.0
The remainder is 573 after subtracting 4860 from 5433.
Grab the next digit (2) from the dividend, add it to 573, then carry on: 5732 / 810

Let's proceed to step 7:
When dividing 5732 by 810, we get 7 with a remainder of 62.
Write down 7 as next digit of the result. 
Result so far: 11167.0
Subtracting 5670 from 5732 leaves us with 62.
Take the next digit (0) from the dividend and append it to 62, then repeat: 620 / 810

Let's proceed to step 8:
810 can be fit into 620 0 times, resulting in a remainder of 620.
The number 0 becomes the next digit in our result. 
Result so far: 111670.0
Deduct 0 from 620 and we're left with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 9:
If we divide 6200 by 810, we get 7 and a remainder of 530.
Put 7 as the next digit of the answer. 
Result so far: 111670.7
Deduct 5670 from 6200 and we're left with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Step 10:
If we divide 5300 by 810, we get 6 and a remainder of 440.
The number 6 becomes the next digit in our result. 
Result so far: 111670.76
The remainder is 440 after subtracting 4860 from 5300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 11:
When dividing 4400 by 810, we get 5 with a remainder of 350.
Write down 5 as next digit of the result. 
Result so far: 111670.765
If we take 4050 away from 4400, we end up with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Let's proceed to step 12:
When dividing 3500 by 810, we get 4 with a remainder of 260.
Record the quotient 4 as the next digit in the result. 
Result so far: 111670.7654
If we take 3240 away from 3500, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Going ahead to step 13:
810 goes into 2600 3 times with a remainder of 170.
The next digit of our result is 3. 
Result so far: 111670.76543
Subtract 2430 from 2600 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 14:
810 goes into 1700 2 times with a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 111670.765432
Subtract 1620 from 1700 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 15:
810 can be fit into 800 0 times, resulting in a remainder of 800.
Write down 0 as next digit of the result. 
Result so far: 111670.765432
Subtract 0 from 800 to get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Step 16:
810 goes into 8000 9 times with a remainder of 710.
The number 9 becomes the next digit in our result. 
Result so far: 111670.76543209
If we subtract 7290 from 8000, we get 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

The quotient of the division is 111670.76543209, and the remainder is 7.1e-07.