We divide 6391888 by 300
The aim is to understand the frequency of 300 in 6391888.

Step 1:
If we divide 6 by 300, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 300

Let's proceed to step 2:
300 can be fit into 63 0 times, resulting in a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 63 and we're left with 63.
Fetch the next digit (9) from the dividend, attach it to 63 and continue: 639 / 300

On to step 3:
300 goes into 639 2 times with a remainder of 39.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 600 away from 639, we end up with 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 300

Moving on to step 4:
391 divided by 300 is 1 with a remainder of 91.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
Deduct 300 from 391 and we're left with 91.
Append the next digit (8) from the dividend to 91 and continue with: 918 / 300

Moving on to step 5:
300 goes into 918 3 times with a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 213.0
Subtracting 900 from 918 leaves us with 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 300

Going ahead to step 6:
188 divided by 300 is 0 with a remainder of 188.
The number 0 becomes the next digit in our result. 
Result so far: 2130.0
Subtracting 0 from 188 leaves us with 188.
Take the next digit (8) from the dividend and append it to 188, then repeat: 1888 / 300

Let's proceed to step 7:
300 can be fit into 1888 6 times, resulting in a remainder of 88.
Write down 6 as next digit of the result. 
Result so far: 21306.0
Deduct 1800 from 1888 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 8:
When dividing 880 by 300, we get 2 with a remainder of 280.
Use 2 as the next digit of our solution. 
Result so far: 21306.2
Subtracting 600 from 880 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 9:
300 goes into 2800 9 times with a remainder of 100.
Write down 9 as next digit of the result. 
Result so far: 21306.29
Deduct 2700 from 2800 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 10:
300 can be fit into 1000 3 times, resulting in a remainder of 100.
Use 3 as the next digit of our solution. 
Result so far: 21306.293
Deduct 900 from 1000 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 11:
If we divide 1000 by 300, we get 3 and a remainder of 100.
The number 3 becomes the next digit in our result. 
Result so far: 21306.2933
Subtract 900 from 1000 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final outcome is 21306.2933, with a leftover of 0.001.