21615987 divided by 854 
The aim is to understand the frequency of 854 in 21615987.

On to step 1:
If we divide 2 by 854, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 854

Advancing to step 2:
854 goes into 21 0 times with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (6) from the dividend after 21, then repeat: 216 / 854

Step 3:
854 goes into 216 0 times with a remainder of 216.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 216 and we're left with 216.
Grab the next digit (1) from the dividend, add it to 216, then carry on: 2161 / 854

Step 4:
If we divide 2161 by 854, we get 2 and a remainder of 453.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 453 after subtracting 1708 from 2161.
Fetch the next digit (5) from the dividend, attach it to 453 and continue: 4535 / 854

Moving on to step 5:
When dividing 4535 by 854, we get 5 with a remainder of 265.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtract 4270 from 4535 to get 265.
Grab the next digit (9) from the dividend, add it to 265, then carry on: 2659 / 854

Let's proceed to step 6:
If we divide 2659 by 854, we get 3 and a remainder of 97.
Record the quotient 3 as the next digit in the result. 
Result so far: 253.0
Deduct 2562 from 2659 and we're left with 97.
Append the next digit (8) from the dividend to 97 and continue with: 978 / 854

Step 7:
If we divide 978 by 854, we get 1 and a remainder of 124.
The number 1 becomes the next digit in our result. 
Result so far: 2531.0
Subtracting 854 from 978 leaves us with 124.
Append the next digit (7) from the dividend to 124 and continue with: 1247 / 854

Step 8:
If we divide 1247 by 854, we get 1 and a remainder of 393.
Put 1 as the next digit of the answer. 
Result so far: 25311.0
Subtract 854 from 1247 to get 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Going ahead to step 9:
854 can be fit into 3930 4 times, resulting in a remainder of 514.
Record the quotient 4 as the next digit in the result. 
Result so far: 25311.4
Deduct 3416 from 3930 and we're left with 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

Step 10:
854 can be fit into 5140 6 times, resulting in a remainder of 16.
The next digit of our result is 6. 
Result so far: 25311.46
Subtracting 5124 from 5140 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
160 divided by 854 is 0 with a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 25311.46
If we subtract 0 from 160, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 12:
854 goes into 1600 1 times with a remainder of 746.
The number 1 becomes the next digit in our result. 
Result so far: 25311.4601
The remainder is 746 after subtracting 854 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7460, and continue the process.

Step 13:
854 can be fit into 7460 8 times, resulting in a remainder of 628.
Put 8 as the next digit of the answer. 
Result so far: 25311.46018
Subtract 6832 from 7460 to get 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

On to step 14:
854 can be fit into 6280 7 times, resulting in a remainder of 302.
Write down 7 as next digit of the result. 
Result so far: 25311.460187
Deduct 5978 from 6280 and we're left with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Going ahead to step 15:
854 goes into 3020 3 times with a remainder of 458.
The number 3 becomes the next digit in our result. 
Result so far: 25311.4601873
Subtract 2562 from 3020 to get 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Moving on to step 16:
854 goes into 4580 5 times with a remainder of 310.
The number 5 becomes the next digit in our result. 
Result so far: 25311.46018735
Deduct 4270 from 4580 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Our division results in 25311.46018735 with a remaining 3.1e-07.