21255687 ÷ 440 
The aim is to understand the frequency of 440 in 21255687.

On to step 1:
The number 440 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 440

Advancing to step 2:
If we divide 21 by 440, we get 0 and a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 440

On to step 3:
212 divided by 440 is 0 with a remainder of 212.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 212, we get 212.
Grab the next digit (5) from the dividend, add it to 212, then carry on: 2125 / 440

Let's proceed to step 4:
440 can be fit into 2125 4 times, resulting in a remainder of 365.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 1760 from 2125, we get 365.
Fetch the next digit (5) from the dividend, attach it to 365 and continue: 3655 / 440

Let's proceed to step 5:
440 goes into 3655 8 times with a remainder of 135.
Put 8 as the next digit of the answer. 
Result so far: 48.0
Subtracting 3520 from 3655 leaves us with 135.
Take the next digit (6) from the dividend and append it to 135, then repeat: 1356 / 440

Let's proceed to step 6:
If we divide 1356 by 440, we get 3 and a remainder of 36.
Put 3 as the next digit of the answer. 
Result so far: 483.0
If we take 1320 away from 1356, we end up with 36.
Fetch the next digit (8) from the dividend, attach it to 36 and continue: 368 / 440

Moving on to step 7:
440 goes into 368 0 times with a remainder of 368.
Write down 0 as next digit of the result. 
Result so far: 4830.0
If we subtract 0 from 368, we get 368.
Append the next digit (7) from the dividend to 368 and continue with: 3687 / 440

Going ahead to step 8:
440 goes into 3687 8 times with a remainder of 167.
Put 8 as the next digit of the answer. 
Result so far: 48308.0
Deduct 3520 from 3687 and we're left with 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

Advancing to step 9:
The number 440 fits into 1670 3 times, leaving a remainder of 350.
Write down 3 as next digit of the result. 
Result so far: 48308.3
The remainder is 350 after subtracting 1320 from 1670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 10:
When dividing 3500 by 440, we get 7 with a remainder of 420.
Write down 7 as next digit of the result. 
Result so far: 48308.37
Subtract 3080 from 3500 to get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Moving on to step 11:
The number 440 fits into 4200 9 times, leaving a remainder of 240.
Put 9 as the next digit of the answer. 
Result so far: 48308.379
If we subtract 3960 from 4200, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 12:
440 goes into 2400 5 times with a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 48308.3795
If we take 2200 away from 2400, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 13:
When dividing 2000 by 440, we get 4 with a remainder of 240.
Put 4 as the next digit of the answer. 
Result so far: 48308.37954
The remainder is 240 after subtracting 1760 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 14:
If we divide 2400 by 440, we get 5 and a remainder of 200.
Put 5 as the next digit of the answer. 
Result so far: 48308.379545
Deduct 2200 from 2400 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 15:
When dividing 2000 by 440, we get 4 with a remainder of 240.
Record the quotient 4 as the next digit in the result. 
Result so far: 48308.3795454
Subtracting 1760 from 2000 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 16:
440 can be fit into 2400 5 times, resulting in a remainder of 200.
Record the quotient 5 as the next digit in the result. 
Result so far: 48308.37954545
Subtract 2200 from 2400 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final outcome is 48308.37954545, with a leftover of 2e-07.