4408473 ÷ 646 
The aim is to understand the frequency of 646 in 4408473.

Advancing to step 1:
The number 646 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 646

Moving on to step 2:
646 can be fit into 44 0 times, resulting in a remainder of 44.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 44 leaves us with 44.
Bring next digit (0) of the dividend behind the 44 and repeat the process: 440 / 646

On to step 3:
646 goes into 440 0 times with a remainder of 440.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 440 after subtracting 0 from 440.
Take the next digit (8) from the dividend and append it to 440, then repeat: 4408 / 646

On to step 4:
646 can be fit into 4408 6 times, resulting in a remainder of 532.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 532 after subtracting 3876 from 4408.
Bring next digit (4) of the dividend behind the 532 and repeat the process: 5324 / 646

Advancing to step 5:
5324 divided by 646 is 8 with a remainder of 156.
The number 8 becomes the next digit in our result. 
Result so far: 68.0
Subtracting 5168 from 5324 leaves us with 156.
Append the next digit (7) from the dividend to 156 and continue with: 1567 / 646

Advancing to step 6:
1567 divided by 646 is 2 with a remainder of 275.
Use 2 as the next digit of our solution. 
Result so far: 682.0
Subtract 1292 from 1567 to get 275.
Append the next digit (3) from the dividend to 275 and continue with: 2753 / 646

Step 7:
The number 646 fits into 2753 4 times, leaving a remainder of 169.
Record the quotient 4 as the next digit in the result. 
Result so far: 6824.0
If we subtract 2584 from 2753, we get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Moving on to step 8:
When dividing 1690 by 646, we get 2 with a remainder of 398.
Write down 2 as next digit of the result. 
Result so far: 6824.2
If we take 1292 away from 1690, we end up with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

On to step 9:
When dividing 3980 by 646, we get 6 with a remainder of 104.
Put 6 as the next digit of the answer. 
Result so far: 6824.26
If we take 3876 away from 3980, we end up with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Let's proceed to step 10:
1040 divided by 646 is 1 with a remainder of 394.
Record the quotient 1 as the next digit in the result. 
Result so far: 6824.261
If we subtract 646 from 1040, we get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

On to step 11:
The number 646 fits into 3940 6 times, leaving a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 6824.2616
If we subtract 3876 from 3940, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 12:
The number 646 fits into 640 0 times, leaving a remainder of 640.
The number 0 becomes the next digit in our result. 
Result so far: 6824.2616
Deduct 0 from 640 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 13:
The number 646 fits into 6400 9 times, leaving a remainder of 586.
Put 9 as the next digit of the answer. 
Result so far: 6824.261609
If we subtract 5814 from 6400, we get 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

Going ahead to step 14:
5860 divided by 646 is 9 with a remainder of 46.
The number 9 becomes the next digit in our result. 
Result so far: 6824.2616099
Deduct 5814 from 5860 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

After the division, we end up with 6824.2616099 and a remainder of 4.6e-07.