Let's divide 33421825 by 646
The aim is to understand the frequency of 646 in 33421825.

Advancing to step 1:
The number 646 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 646

Moving on to step 2:
646 can be fit into 33 0 times, resulting in a remainder of 33.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 33, we end up with 33.
Take the next digit (4) from the dividend and append it to 33, then repeat: 334 / 646

Advancing to step 3:
When dividing 334 by 646, we get 0 with a remainder of 334.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 334 leaves us with 334.
Bring next digit (2) of the dividend behind the 334 and repeat the process: 3342 / 646

Step 4:
If we divide 3342 by 646, we get 5 and a remainder of 112.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtract 3230 from 3342 to get 112.
Grab the next digit (1) from the dividend, add it to 112, then carry on: 1121 / 646

Step 5:
1121 divided by 646 is 1 with a remainder of 475.
Use 1 as the next digit of our solution. 
Result so far: 51.0
If we take 646 away from 1121, we end up with 475.
Append the next digit (8) from the dividend to 475 and continue with: 4758 / 646

Step 6:
646 can be fit into 4758 7 times, resulting in a remainder of 236.
The next digit of our result is 7. 
Result so far: 517.0
Subtract 4522 from 4758 to get 236.
Grab the next digit (2) from the dividend, add it to 236, then carry on: 2362 / 646

Moving on to step 7:
646 goes into 2362 3 times with a remainder of 424.
Use 3 as the next digit of our solution. 
Result so far: 5173.0
Subtract 1938 from 2362 to get 424.
Append the next digit (5) from the dividend to 424 and continue with: 4245 / 646

Let's proceed to step 8:
646 can be fit into 4245 6 times, resulting in a remainder of 369.
Write down 6 as next digit of the result. 
Result so far: 51736.0
If we take 3876 away from 4245, we end up with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

On to step 9:
When dividing 3690 by 646, we get 5 with a remainder of 460.
Use 5 as the next digit of our solution. 
Result so far: 51736.5
Deduct 3230 from 3690 and we're left with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Going ahead to step 10:
If we divide 4600 by 646, we get 7 and a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 51736.57
If we subtract 4522 from 4600, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 11:
If we divide 780 by 646, we get 1 and a remainder of 134.
The number 1 becomes the next digit in our result. 
Result so far: 51736.571
If we subtract 646 from 780, we get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Going ahead to step 12:
The number 646 fits into 1340 2 times, leaving a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 51736.5712
If we take 1292 away from 1340, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 13:
480 divided by 646 is 0 with a remainder of 480.
Put 0 as the next digit of the answer. 
Result so far: 51736.5712
If we subtract 0 from 480, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Moving on to step 14:
4800 divided by 646 is 7 with a remainder of 278.
Write down 7 as next digit of the result. 
Result so far: 51736.571207
If we subtract 4522 from 4800, we get 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

On to step 15:
2780 divided by 646 is 4 with a remainder of 196.
The next digit of our result is 4. 
Result so far: 51736.5712074
Deduct 2584 from 2780 and we're left with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Advancing to step 16:
646 can be fit into 1960 3 times, resulting in a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 51736.57120743
If we subtract 1938 from 1960, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final outcome is 51736.57120743, with a leftover of 2.2e-08.