We look at the division of 93181228 by 646 
The aim is to understand the frequency of 646 in 93181228.

Let's proceed to step 1:
The number 646 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 646

Let's proceed to step 2:
When dividing 93 by 646, we get 0 with a remainder of 93.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 93, we get 93.
Bring next digit (1) of the dividend behind the 93 and repeat the process: 931 / 646

Going ahead to step 3:
When dividing 931 by 646, we get 1 with a remainder of 285.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 646 from 931 to get 285.
Take the next digit (8) from the dividend and append it to 285, then repeat: 2858 / 646

Let's proceed to step 4:
646 goes into 2858 4 times with a remainder of 274.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
If we take 2584 away from 2858, we end up with 274.
Grab the next digit (1) from the dividend, add it to 274, then carry on: 2741 / 646

Let's proceed to step 5:
The number 646 fits into 2741 4 times, leaving a remainder of 157.
Write down 4 as next digit of the result. 
Result so far: 144.0
The remainder is 157 after subtracting 2584 from 2741.
Include the next digit (2) from the dividend after 157, then repeat: 1572 / 646

Advancing to step 6:
If we divide 1572 by 646, we get 2 and a remainder of 280.
Use 2 as the next digit of our solution. 
Result so far: 1442.0
If we take 1292 away from 1572, we end up with 280.
Include the next digit (2) from the dividend after 280, then repeat: 2802 / 646

Advancing to step 7:
646 can be fit into 2802 4 times, resulting in a remainder of 218.
Record the quotient 4 as the next digit in the result. 
Result so far: 14424.0
The remainder is 218 after subtracting 2584 from 2802.
Append the next digit (8) from the dividend to 218 and continue with: 2188 / 646

Step 8:
2188 divided by 646 is 3 with a remainder of 250.
Record the quotient 3 as the next digit in the result. 
Result so far: 144243.0
If we subtract 1938 from 2188, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Let's proceed to step 9:
646 can be fit into 2500 3 times, resulting in a remainder of 562.
Put 3 as the next digit of the answer. 
Result so far: 144243.3
Subtract 1938 from 2500 to get 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

On to step 10:
5620 divided by 646 is 8 with a remainder of 452.
Use 8 as the next digit of our solution. 
Result so far: 144243.38
Subtracting 5168 from 5620 leaves us with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

On to step 11:
646 can be fit into 4520 6 times, resulting in a remainder of 644.
Write down 6 as next digit of the result. 
Result so far: 144243.386
Subtract 3876 from 4520 to get 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Step 12:
If we divide 6440 by 646, we get 9 and a remainder of 626.
Write down 9 as next digit of the result. 
Result so far: 144243.3869
The remainder is 626 after subtracting 5814 from 6440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

Let's proceed to step 13:
If we divide 6260 by 646, we get 9 and a remainder of 446.
Put 9 as the next digit of the answer. 
Result so far: 144243.38699
If we take 5814 away from 6260, we end up with 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

The quotient of the division is 144243.38699, and the remainder is 0.000446.