21308560 divided by 612 
The aim is to understand the frequency of 612 in 21308560.

On to step 1:
The number 612 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 612

On to step 2:
If we divide 21 by 612, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 612

Going ahead to step 3:
When dividing 213 by 612, we get 0 with a remainder of 213.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 213 after subtracting 0 from 213.
Grab the next digit (0) from the dividend, add it to 213, then carry on: 2130 / 612

Moving on to step 4:
612 goes into 2130 3 times with a remainder of 294.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1836 from 2130 leaves us with 294.
Take the next digit (8) from the dividend and append it to 294, then repeat: 2948 / 612

On to step 5:
612 goes into 2948 4 times with a remainder of 500.
Use 4 as the next digit of our solution. 
Result so far: 34.0
Deduct 2448 from 2948 and we're left with 500.
Grab the next digit (5) from the dividend, add it to 500, then carry on: 5005 / 612

Step 6:
5005 divided by 612 is 8 with a remainder of 109.
Record the quotient 8 as the next digit in the result. 
Result so far: 348.0
Subtracting 4896 from 5005 leaves us with 109.
Include the next digit (6) from the dividend after 109, then repeat: 1096 / 612

Going ahead to step 7:
1096 divided by 612 is 1 with a remainder of 484.
The number 1 becomes the next digit in our result. 
Result so far: 3481.0
Subtract 612 from 1096 to get 484.
Include the next digit (0) from the dividend after 484, then repeat: 4840 / 612

Let's proceed to step 8:
When dividing 4840 by 612, we get 7 with a remainder of 556.
The next digit of our result is 7. 
Result so far: 34817.0
Subtract 4284 from 4840 to get 556.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

Going ahead to step 9:
When dividing 5560 by 612, we get 9 with a remainder of 52.
The number 9 becomes the next digit in our result. 
Result so far: 34817.9
Subtract 5508 from 5560 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 10:
612 goes into 520 0 times with a remainder of 520.
The number 0 becomes the next digit in our result. 
Result so far: 34817.9
Subtracting 0 from 520 leaves us with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Step 11:
When dividing 5200 by 612, we get 8 with a remainder of 304.
Record the quotient 8 as the next digit in the result. 
Result so far: 34817.908
If we take 4896 away from 5200, we end up with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Let's proceed to step 12:
612 goes into 3040 4 times with a remainder of 592.
Write down 4 as next digit of the result. 
Result so far: 34817.9084
The remainder is 592 after subtracting 2448 from 3040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Advancing to step 13:
When dividing 5920 by 612, we get 9 with a remainder of 412.
The number 9 becomes the next digit in our result. 
Result so far: 34817.90849
If we take 5508 away from 5920, we end up with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Going ahead to step 14:
If we divide 4120 by 612, we get 6 and a remainder of 448.
The number 6 becomes the next digit in our result. 
Result so far: 34817.908496
Subtracting 3672 from 4120 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Moving on to step 15:
4480 divided by 612 is 7 with a remainder of 196.
Use 7 as the next digit of our solution. 
Result so far: 34817.9084967
Subtracting 4284 from 4480 leaves us with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Step 16:
1960 divided by 612 is 3 with a remainder of 124.
Record the quotient 3 as the next digit in the result. 
Result so far: 34817.90849673
Subtracting 1836 from 1960 leaves us with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

The final outcome is 34817.90849673, with a leftover of 1.24e-07.