55320666 ÷ 821 
The aim is to understand the frequency of 821 in 55320666.

On to step 1:
821 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 821

Advancing to step 2:
821 can be fit into 55 0 times, resulting in a remainder of 55.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 55, we get 55.
Append the next digit (3) from the dividend to 55 and continue with: 553 / 821

Moving on to step 3:
821 can be fit into 553 0 times, resulting in a remainder of 553.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 553, we get 553.
Grab the next digit (2) from the dividend, add it to 553, then carry on: 5532 / 821

Step 4:
5532 divided by 821 is 6 with a remainder of 606.
The next digit of our result is 6. 
Result so far: 6.0
If we take 4926 away from 5532, we end up with 606.
Include the next digit (0) from the dividend after 606, then repeat: 6060 / 821

Going ahead to step 5:
821 can be fit into 6060 7 times, resulting in a remainder of 313.
Use 7 as the next digit of our solution. 
Result so far: 67.0
If we subtract 5747 from 6060, we get 313.
Include the next digit (6) from the dividend after 313, then repeat: 3136 / 821

Step 6:
When dividing 3136 by 821, we get 3 with a remainder of 673.
The number 3 becomes the next digit in our result. 
Result so far: 673.0
If we subtract 2463 from 3136, we get 673.
Fetch the next digit (6) from the dividend, attach it to 673 and continue: 6736 / 821

Going ahead to step 7:
If we divide 6736 by 821, we get 8 and a remainder of 168.
The next digit of our result is 8. 
Result so far: 6738.0
Subtracting 6568 from 6736 leaves us with 168.
Take the next digit (6) from the dividend and append it to 168, then repeat: 1686 / 821

Advancing to step 8:
When dividing 1686 by 821, we get 2 with a remainder of 44.
The next digit of our result is 2. 
Result so far: 67382.0
Subtract 1642 from 1686 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 9:
When dividing 440 by 821, we get 0 with a remainder of 440.
The number 0 becomes the next digit in our result. 
Result so far: 67382.0
The remainder is 440 after subtracting 0 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 10:
4400 divided by 821 is 5 with a remainder of 295.
The next digit of our result is 5. 
Result so far: 67382.05
The remainder is 295 after subtracting 4105 from 4400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

Advancing to step 11:
821 can be fit into 2950 3 times, resulting in a remainder of 487.
The number 3 becomes the next digit in our result. 
Result so far: 67382.053
Deduct 2463 from 2950 and we're left with 487.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

Step 12:
The number 821 fits into 4870 5 times, leaving a remainder of 765.
Write down 5 as next digit of the result. 
Result so far: 67382.0535
Deduct 4105 from 4870 and we're left with 765.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7650, and continue the process.

Step 13:
821 goes into 7650 9 times with a remainder of 261.
Put 9 as the next digit of the answer. 
Result so far: 67382.05359
If we subtract 7389 from 7650, we get 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

On to step 14:
When dividing 2610 by 821, we get 3 with a remainder of 147.
Use 3 as the next digit of our solution. 
Result so far: 67382.053593
Subtracting 2463 from 2610 leaves us with 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

On to step 15:
The number 821 fits into 1470 1 times, leaving a remainder of 649.
Write down 1 as next digit of the result. 
Result so far: 67382.0535931
Subtract 821 from 1470 to get 649.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6490, and continue the process.

On to step 16:
821 can be fit into 6490 7 times, resulting in a remainder of 743.
Use 7 as the next digit of our solution. 
Result so far: 67382.05359317
Deduct 5747 from 6490 and we're left with 743.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7430, and continue the process.

The final result is 67382.05359317 with a remainder of 7.43e-07.