We look at the division of 45812354 by 821 
The aim is to understand the frequency of 821 in 45812354.

Step 1:
When dividing 4 by 821, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 821

On to step 2:
If we divide 45 by 821, we get 0 and a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Bring next digit (8) of the dividend behind the 45 and repeat the process: 458 / 821

Step 3:
When dividing 458 by 821, we get 0 with a remainder of 458.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 458, we end up with 458.
Fetch the next digit (1) from the dividend, attach it to 458 and continue: 4581 / 821

Going ahead to step 4:
If we divide 4581 by 821, we get 5 and a remainder of 476.
The next digit of our result is 5. 
Result so far: 5.0
The remainder is 476 after subtracting 4105 from 4581.
Append the next digit (2) from the dividend to 476 and continue with: 4762 / 821

Going ahead to step 5:
4762 divided by 821 is 5 with a remainder of 657.
Record the quotient 5 as the next digit in the result. 
Result so far: 55.0
The remainder is 657 after subtracting 4105 from 4762.
Append the next digit (3) from the dividend to 657 and continue with: 6573 / 821

Step 6:
The number 821 fits into 6573 8 times, leaving a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 558.0
If we subtract 6568 from 6573, we get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 821

On to step 7:
If we divide 55 by 821, we get 0 and a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 5580.0
Subtract 0 from 55 to get 55.
Include the next digit (4) from the dividend after 55, then repeat: 554 / 821

On to step 8:
The number 821 fits into 554 0 times, leaving a remainder of 554.
Write down 0 as next digit of the result. 
Result so far: 55800.0
Subtracting 0 from 554 leaves us with 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Going ahead to step 9:
If we divide 5540 by 821, we get 6 and a remainder of 614.
Record the quotient 6 as the next digit in the result. 
Result so far: 55800.6
Subtract 4926 from 5540 to get 614.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6140, and continue the process.

Advancing to step 10:
821 can be fit into 6140 7 times, resulting in a remainder of 393.
Use 7 as the next digit of our solution. 
Result so far: 55800.67
If we subtract 5747 from 6140, we get 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Advancing to step 11:
821 can be fit into 3930 4 times, resulting in a remainder of 646.
Put 4 as the next digit of the answer. 
Result so far: 55800.674
If we subtract 3284 from 3930, we get 646.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6460, and continue the process.

On to step 12:
6460 divided by 821 is 7 with a remainder of 713.
Record the quotient 7 as the next digit in the result. 
Result so far: 55800.6747
Deduct 5747 from 6460 and we're left with 713.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7130, and continue the process.

Step 13:
When dividing 7130 by 821, we get 8 with a remainder of 562.
Record the quotient 8 as the next digit in the result. 
Result so far: 55800.67478
If we take 6568 away from 7130, we end up with 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

Going ahead to step 14:
When dividing 5620 by 821, we get 6 with a remainder of 694.
Put 6 as the next digit of the answer. 
Result so far: 55800.674786
Deduct 4926 from 5620 and we're left with 694.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6940, and continue the process.

Let's proceed to step 15:
6940 divided by 821 is 8 with a remainder of 372.
Put 8 as the next digit of the answer. 
Result so far: 55800.6747868
Subtract 6568 from 6940 to get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Moving on to step 16:
821 can be fit into 3720 4 times, resulting in a remainder of 436.
The next digit of our result is 4. 
Result so far: 55800.67478684
The remainder is 436 after subtracting 3284 from 3720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

The final outcome is 55800.67478684, with a leftover of 4.36e-07.