80582781 ÷ 621 
The aim is to understand the frequency of 621 in 80582781.

Going ahead to step 1:
8 divided by 621 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 621

Advancing to step 2:
621 goes into 80 0 times with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Bring next digit (5) of the dividend behind the 80 and repeat the process: 805 / 621

Moving on to step 3:
When dividing 805 by 621, we get 1 with a remainder of 184.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 621 from 805 leaves us with 184.
Grab the next digit (8) from the dividend, add it to 184, then carry on: 1848 / 621

On to step 4:
When dividing 1848 by 621, we get 2 with a remainder of 606.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 606 after subtracting 1242 from 1848.
Fetch the next digit (2) from the dividend, attach it to 606 and continue: 6062 / 621

Step 5:
When dividing 6062 by 621, we get 9 with a remainder of 473.
Record the quotient 9 as the next digit in the result. 
Result so far: 129.0
Subtract 5589 from 6062 to get 473.
Take the next digit (7) from the dividend and append it to 473, then repeat: 4737 / 621

Let's proceed to step 6:
When dividing 4737 by 621, we get 7 with a remainder of 390.
The next digit of our result is 7. 
Result so far: 1297.0
The remainder is 390 after subtracting 4347 from 4737.
Bring next digit (8) of the dividend behind the 390 and repeat the process: 3908 / 621

Step 7:
The number 621 fits into 3908 6 times, leaving a remainder of 182.
Use 6 as the next digit of our solution. 
Result so far: 12976.0
Subtract 3726 from 3908 to get 182.
Fetch the next digit (1) from the dividend, attach it to 182 and continue: 1821 / 621

Moving on to step 8:
When dividing 1821 by 621, we get 2 with a remainder of 579.
Write down 2 as next digit of the result. 
Result so far: 129762.0
Subtracting 1242 from 1821 leaves us with 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5790, and continue the process.

On to step 9:
If we divide 5790 by 621, we get 9 and a remainder of 201.
Put 9 as the next digit of the answer. 
Result so far: 129762.9
If we subtract 5589 from 5790, we get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Going ahead to step 10:
The number 621 fits into 2010 3 times, leaving a remainder of 147.
Record the quotient 3 as the next digit in the result. 
Result so far: 129762.93
Deduct 1863 from 2010 and we're left 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.

Let's proceed to step 11:
The number 621 fits into 1470 2 times, leaving a remainder of 228.
Use 2 as the next digit of our solution. 
Result so far: 129762.932
Deduct 1242 from 1470 and we're left 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.

Advancing to step 12:
The number 621 fits into 2280 3 times, leaving a remainder of 417.
Put 3 as the next digit of the answer. 
Result so far: 129762.9323
If we take 1863 away from 2280, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Step 13:
If we divide 4170 by 621, we get 6 and a remainder of 444.
The next digit of our result is 6. 
Result so far: 129762.93236
Subtracting 3726 from 4170 leaves us with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

Advancing to step 14:
The number 621 fits into 4440 7 times, leaving a remainder of 93.
Record the quotient 7 as the next digit in the result. 
Result so far: 129762.932367
Subtract 4347 from 4440 to get 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Going ahead to step 15:
The number 621 fits into 930 1 times, leaving a remainder of 309.
Put 1 as the next digit of the answer. 
Result so far: 129762.9323671
Deduct 621 from 930 and we're left with 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

Let's proceed to step 16:
When dividing 3090 by 621, we get 4 with a remainder of 606.
The number 4 becomes the next digit in our result. 
Result so far: 129762.93236714
Deduct 2484 from 3090 and we're left with 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

The final result is 129762.93236714 with a remainder of 6.06e-07.