We're dividing 3412953 by 621 
The aim is to understand the frequency of 621 in 3412953.

Step 1:
621 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 621

Advancing to step 2:
621 goes into 34 0 times with a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 34, we get 34.
Grab the next digit (1) from the dividend, add it to 34, then carry on: 341 / 621

Let's proceed to step 3:
When dividing 341 by 621, we get 0 with a remainder of 341.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 341 and we're left with 341.
Take the next digit (2) from the dividend and append it to 341, then repeat: 3412 / 621

Moving on to step 4:
621 goes into 3412 5 times with a remainder of 307.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 3105 from 3412 to get 307.
Fetch the next digit (9) from the dividend, attach it to 307 and continue: 3079 / 621

Let's proceed to step 5:
621 goes into 3079 4 times with a remainder of 595.
Write down 4 as next digit of the result. 
Result so far: 54.0
The remainder is 595 after subtracting 2484 from 3079.
Grab the next digit (5) from the dividend, add it to 595, then carry on: 5955 / 621

Going ahead to step 6:
621 can be fit into 5955 9 times, resulting in a remainder of 366.
The number 9 becomes the next digit in our result. 
Result so far: 549.0
If we take 5589 away from 5955, we end up with 366.
Fetch the next digit (3) from the dividend, attach it to 366 and continue: 3663 / 621

Going ahead to step 7:
When dividing 3663 by 621, we get 5 with a remainder of 558.
Write down 5 as next digit of the result. 
Result so far: 5495.0
The remainder is 558 after subtracting 3105 from 3663.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Let's proceed to step 8:
If we divide 5580 by 621, we get 8 and a remainder of 612.
The number 8 becomes the next digit in our result. 
Result so far: 5495.8
If we take 4968 away from 5580, we end up with 612.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6120, and continue the process.

Let's proceed to step 9:
621 goes into 6120 9 times with a remainder of 531.
Use 9 as the next digit of our solution. 
Result so far: 5495.89
If we take 5589 away from 6120, we end up with 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5310, and continue the process.

Going ahead to step 10:
If we divide 5310 by 621, we get 8 and a remainder of 342.
Record the quotient 8 as the next digit in the result. 
Result so far: 5495.898
Subtracting 4968 from 5310 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Let's proceed to step 11:
The number 621 fits into 3420 5 times, leaving a remainder of 315.
Write down 5 as next digit of the result. 
Result so far: 5495.8985
Subtracting 3105 from 3420 leaves us with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Let's proceed to step 12:
When dividing 3150 by 621, we get 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 5495.89855
The remainder is 45 after subtracting 3105 from 3150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The final outcome is 5495.89855, with a leftover of 4.5e-05.