621824 divided by 71 
The aim is to understand the frequency of 71 in 621824.

On to step 1:
6 divided by 71 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 71

Going ahead to step 2:
The number 71 fits into 62 0 times, leaving a remainder of 62.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 62, we end up with 62.
Append the next digit (1) from the dividend to 62 and continue with: 621 / 71

Step 3:
71 goes into 621 8 times with a remainder of 53.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 568 from 621 and we're left with 53.
Append the next digit (8) from the dividend to 53 and continue with: 538 / 71

Step 4:
538 divided by 71 is 7 with a remainder of 41.
Record the quotient 7 as the next digit in the result. 
Result so far: 87.0
If we take 497 away from 538, we end up with 41.
Grab the next digit (2) from the dividend, add it to 41, then carry on: 412 / 71

Moving on to step 5:
71 goes into 412 5 times with a remainder of 57.
Record the quotient 5 as the next digit in the result. 
Result so far: 875.0
Subtract 355 from 412 to get 57.
Take the next digit (4) from the dividend and append it to 57, then repeat: 574 / 71

Going ahead to step 6:
When dividing 574 by 71, we get 8 with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 8758.0
Subtract 568 from 574 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
71 goes into 60 0 times with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 8758.0
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
When dividing 600 by 71, we get 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 8758.08
The remainder is 32 after subtracting 568 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 9:
When dividing 320 by 71, we get 4 with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 8758.084
Deduct 284 from 320 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 10:
When dividing 360 by 71, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 8758.0845
The remainder is 5 after subtracting 355 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 11:
If we divide 50 by 71, we get 0 and a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 8758.0845
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 12:
71 goes into 500 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 8758.084507
Deduct 497 from 500 and we're left 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.

Going ahead to step 13:
71 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 8758.084507
Subtract 0 from 30 to 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.

Going ahead to step 14:
71 can be fit into 300 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 8758.08450704
If we take 284 away from 300, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 8758.08450704, with a leftover of 1.6e-08.