642861 divided by 306 
The aim is to understand the frequency of 306 in 642861.

Let's proceed to step 1:
The number 306 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 306

On to step 2:
306 can be fit into 64 0 times, resulting in a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Bring next digit (2) of the dividend behind the 64 and repeat the process: 642 / 306

On to step 3:
306 goes into 642 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 612 from 642 and we're left with 30.
Grab the next digit (8) from the dividend, add it to 30, then carry on: 308 / 306

On to step 4:
When dividing 308 by 306, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtract 306 from 308 to get 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 306

Moving on to step 5:
If we divide 26 by 306, we get 0 and a remainder of 26.
The next digit of our result is 0. 
Result so far: 210.0
Deduct 0 from 26 and we're left with 26.
Fetch the next digit (1) from the dividend, attach it to 26 and continue: 261 / 306

On to step 6:
When dividing 261 by 306, we get 0 with a remainder of 261.
The next digit of our result is 0. 
Result so far: 2100.0
Subtract 0 from 261 to get 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Moving on to step 7:
The number 306 fits into 2610 8 times, leaving a remainder of 162.
Write down 8 as next digit of the result. 
Result so far: 2100.8
Subtracting 2448 from 2610 leaves us with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Advancing to step 8:
If we divide 1620 by 306, we get 5 and a remainder of 90.
The number 5 becomes the next digit in our result. 
Result so far: 2100.85
If we take 1530 away from 1620, we end up with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 9:
306 can be fit into 900 2 times, resulting in a remainder of 288.
The number 2 becomes the next digit in our result. 
Result so far: 2100.852
Deduct 612 from 900 and we're left with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

On to step 10:
306 goes into 2880 9 times with a remainder of 126.
Put 9 as the next digit of the answer. 
Result so far: 2100.8529
Subtract 2754 from 2880 to get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Moving on to step 11:
The number 306 fits into 1260 4 times, leaving a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 2100.85294
If we take 1224 away from 1260, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 12:
306 goes into 360 1 times with a remainder of 54.
The next digit of our result is 1. 
Result so far: 2100.852941
If we subtract 306 from 360, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 13:
When dividing 540 by 306, we get 1 with a remainder of 234.
Put 1 as the next digit of the answer. 
Result so far: 2100.8529411
If we subtract 306 from 540, we get 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

After the division, we end up with 2100.8529411 and a remainder of 2.34e-06.