We look at the division of 21649641 by 218 
The aim is to understand the frequency of 218 in 21649641.

On to step 1:
If we divide 2 by 218, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 218

Let's proceed to step 2:
218 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 218

Let's proceed to step 3:
218 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
The remainder is 216 after subtracting 0 from 216.
Bring next digit (4) of the dividend behind the 216 and repeat the process: 2164 / 218

Let's proceed to step 4:
When dividing 2164 by 218, we get 9 with a remainder of 202.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 202 after subtracting 1962 from 2164.
Append the next digit (9) from the dividend to 202 and continue with: 2029 / 218

Going ahead to step 5:
If we divide 2029 by 218, we get 9 and a remainder of 67.
The next digit of our result is 9. 
Result so far: 99.0
Subtracting 1962 from 2029 leaves us with 67.
Grab the next digit (6) from the dividend, add it to 67, then carry on: 676 / 218

Moving on to step 6:
If we divide 676 by 218, we get 3 and a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 993.0
The remainder is 22 after subtracting 654 from 676.
Fetch the next digit (4) from the dividend, attach it to 22 and continue: 224 / 218

Going ahead to step 7:
The number 218 fits into 224 1 times, leaving a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 9931.0
Deduct 218 from 224 and we're left with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 218

On to step 8:
When dividing 61 by 218, we get 0 with a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 99310.0
The remainder is 61 after subtracting 0 from 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 9:
If we divide 610 by 218, we get 2 and a remainder of 174.
The next digit of our result is 2. 
Result so far: 99310.2
If we subtract 436 from 610, we get 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Step 10:
The number 218 fits into 1740 7 times, leaving a remainder of 214.
Record the quotient 7 as the next digit in the result. 
Result so far: 99310.27
If we take 1526 away from 1740, we end up with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Let's proceed to step 11:
218 goes into 2140 9 times with a remainder of 178.
Write down 9 as next digit of the result. 
Result so far: 99310.279
Deduct 1962 from 2140 and we're left with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Let's proceed to step 12:
If we divide 1780 by 218, we get 8 and a remainder of 36.
The next digit of our result is 8. 
Result so far: 99310.2798
Subtract 1744 from 1780 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 13:
If we divide 360 by 218, we get 1 and a remainder of 142.
Record the quotient 1 as the next digit in the result. 
Result so far: 99310.27981
If we subtract 218 from 360, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 14:
When dividing 1420 by 218, we get 6 with a remainder of 112.
The next digit of our result is 6. 
Result so far: 99310.279816
If we take 1308 away from 1420, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 15:
If we divide 1120 by 218, we get 5 and a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 99310.2798165
Subtracting 1090 from 1120 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 16:
218 can be fit into 300 1 times, resulting in a remainder of 82.
Use 1 as the next digit of our solution. 
Result so far: 99310.27981651
If we subtract 218 from 300, we get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The final result is 99310.27981651 with a remainder of 8.2e-08.