21240619 divided by 300 
The aim is to understand the frequency of 300 in 21240619.

Going ahead to step 1:
2 divided by 300 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 300

On to step 2:
The number 300 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (2) of the dividend behind the 21 and repeat the process: 212 / 300

Advancing to step 3:
If we divide 212 by 300, we get 0 and a remainder of 212.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 212 and we're left with 212.
Fetch the next digit (4) from the dividend, attach it to 212 and continue: 2124 / 300

Step 4:
2124 divided by 300 is 7 with a remainder of 24.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 2100 from 2124 and we're left with 24.
Include the next digit (0) from the dividend after 24, then repeat: 240 / 300

On to step 5:
When dividing 240 by 300, we get 0 with a remainder of 240.
The next digit of our result is 0. 
Result so far: 70.0
Subtract 0 from 240 to get 240.
Append the next digit (6) from the dividend to 240 and continue with: 2406 / 300

On to step 6:
If we divide 2406 by 300, we get 8 and a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 708.0
The remainder is 6 after subtracting 2400 from 2406.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 300

Advancing to step 7:
300 goes into 61 0 times with a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 7080.0
The remainder is 61 after subtracting 0 from 61.
Fetch the next digit (9) from the dividend, attach it to 61 and continue: 619 / 300

Moving on to step 8:
If we divide 619 by 300, we get 2 and a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 70802.0
The remainder is 19 after subtracting 600 from 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 9:
When dividing 190 by 300, we get 0 with a remainder of 190.
Use 0 as the next digit of our solution. 
Result so far: 70802.0
Subtract 0 from 190 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Advancing to step 10:
The number 300 fits into 1900 6 times, leaving a remainder of 100.
The number 6 becomes the next digit in our result. 
Result so far: 70802.06
The remainder is 100 after subtracting 1800 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 11:
300 can be fit into 1000 3 times, resulting in a remainder of 100.
Put 3 as the next digit of the answer. 
Result so far: 70802.063
The remainder is 100 after subtracting 900 from 1000.
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 12:
If we divide 1000 by 300, we get 3 and a remainder of 100.
The next digit of our result is 3. 
Result so far: 70802.0633
Subtracting 900 from 1000 leaves us 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.

Our division results in 70802.0633 with a remaining 0.001.