We're dividing 81462472 by 646 
The aim is to understand the frequency of 646 in 81462472.

Advancing to step 1:
646 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 646

Step 2:
When dividing 81 by 646, we get 0 with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Append the next digit (4) from the dividend to 81 and continue with: 814 / 646

On to step 3:
814 divided by 646 is 1 with a remainder of 168.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 646 away from 814, we end up with 168.
Fetch the next digit (6) from the dividend, attach it to 168 and continue: 1686 / 646

Advancing to step 4:
646 can be fit into 1686 2 times, resulting in a remainder of 394.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 1292 from 1686 leaves us with 394.
Bring next digit (2) of the dividend behind the 394 and repeat the process: 3942 / 646

Going ahead to step 5:
The number 646 fits into 3942 6 times, leaving a remainder of 66.
The number 6 becomes the next digit in our result. 
Result so far: 126.0
If we subtract 3876 from 3942, we get 66.
Include the next digit (4) from the dividend after 66, then repeat: 664 / 646

On to step 6:
646 goes into 664 1 times with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 1261.0
If we take 646 away from 664, we end up with 18.
Include the next digit (7) from the dividend after 18, then repeat: 187 / 646

Advancing to step 7:
When dividing 187 by 646, we get 0 with a remainder of 187.
Write down 0 as next digit of the result. 
Result so far: 12610.0
If we take 0 away from 187, we end up with 187.
Include the next digit (2) from the dividend after 187, then repeat: 1872 / 646

Advancing to step 8:
If we divide 1872 by 646, we get 2 and a remainder of 580.
The next digit of our result is 2. 
Result so far: 126102.0
Subtract 1292 from 1872 to get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Advancing to step 9:
5800 divided by 646 is 8 with a remainder of 632.
The number 8 becomes the next digit in our result. 
Result so far: 126102.8
Subtract 5168 from 5800 to get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Moving on to step 10:
If we divide 6320 by 646, we get 9 and a remainder of 506.
The number 9 becomes the next digit in our result. 
Result so far: 126102.89
If we take 5814 away from 6320, we end up with 506.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Moving on to step 11:
5060 divided by 646 is 7 with a remainder of 538.
The number 7 becomes the next digit in our result. 
Result so far: 126102.897
Subtract 4522 from 5060 to get 538.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

Moving on to step 12:
5380 divided by 646 is 8 with a remainder of 212.
Put 8 as the next digit of the answer. 
Result so far: 126102.8978
If we subtract 5168 from 5380, we get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Let's proceed to step 13:
The number 646 fits into 2120 3 times, leaving a remainder of 182.
The next digit of our result is 3. 
Result so far: 126102.89783
Subtract 1938 from 2120 to get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Advancing to step 14:
646 goes into 1820 2 times with a remainder of 528.
Use 2 as the next digit of our solution. 
Result so far: 126102.897832
Subtract 1292 from 1820 to get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Moving on to step 15:
646 can be fit into 5280 8 times, resulting in a remainder of 112.
The number 8 becomes the next digit in our result. 
Result so far: 126102.8978328
Subtracting 5168 from 5280 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 16:
The number 646 fits into 1120 1 times, leaving a remainder of 474.
The next digit of our result is 1. 
Result so far: 126102.89783281
If we subtract 646 from 1120, we get 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

After the division, we end up with 126102.89783281 and a remainder of 4.74e-07.