We divide 72897644 by 221
The aim is to understand the frequency of 221 in 72897644.

Let's proceed to step 1:
7 divided by 221 is 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 221

Step 2:
When dividing 72 by 221, we get 0 with a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 72 to get 72.
Bring next digit (8) of the dividend behind the 72 and repeat the process: 728 / 221

Moving on to step 3:
When dividing 728 by 221, we get 3 with a remainder of 65.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 65 after subtracting 663 from 728.
Take the next digit (9) from the dividend and append it to 65, then repeat: 659 / 221

Going ahead to step 4:
The number 221 fits into 659 2 times, leaving a remainder of 217.
The next digit of our result is 2. 
Result so far: 32.0
If we subtract 442 from 659, we get 217.
Bring next digit (7) of the dividend behind the 217 and repeat the process: 2177 / 221

On to step 5:
The number 221 fits into 2177 9 times, leaving a remainder of 188.
Write down 9 as next digit of the result. 
Result so far: 329.0
If we subtract 1989 from 2177, we get 188.
Grab the next digit (6) from the dividend, add it to 188, then carry on: 1886 / 221

Step 6:
The number 221 fits into 1886 8 times, leaving a remainder of 118.
Record the quotient 8 as the next digit in the result. 
Result so far: 3298.0
If we subtract 1768 from 1886, we get 118.
Grab the next digit (4) from the dividend, add it to 118, then carry on: 1184 / 221

Going ahead to step 7:
221 can be fit into 1184 5 times, resulting in a remainder of 79.
Record the quotient 5 as the next digit in the result. 
Result so far: 32985.0
If we subtract 1105 from 1184, we get 79.
Include the next digit (4) from the dividend after 79, then repeat: 794 / 221

Advancing to step 8:
221 goes into 794 3 times with a remainder of 131.
Record the quotient 3 as the next digit in the result. 
Result so far: 329853.0
If we subtract 663 from 794, we get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Moving on to step 9:
When dividing 1310 by 221, we get 5 with a remainder of 205.
Write down 5 as next digit of the result. 
Result so far: 329853.5
The remainder is 205 after subtracting 1105 from 1310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Let's proceed to step 10:
221 goes into 2050 9 times with a remainder of 61.
The number 9 becomes the next digit in our result. 
Result so far: 329853.59
Subtract 1989 from 2050 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 11:
610 divided by 221 is 2 with a remainder of 168.
The number 2 becomes the next digit in our result. 
Result so far: 329853.592
If we take 442 away from 610, we end up with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Step 12:
1680 divided by 221 is 7 with a remainder of 133.
Record the quotient 7 as the next digit in the result. 
Result so far: 329853.5927
Subtract 1547 from 1680 to get 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

Advancing to step 13:
1330 divided by 221 is 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 329853.59276
If we subtract 1326 from 1330, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 14:
When dividing 40 by 221, we get 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 329853.59276
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 15:
When dividing 400 by 221, we get 1 with a remainder of 179.
Use 1 as the next digit of our solution. 
Result so far: 329853.5927601
Deduct 221 from 400 and we're left with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Going ahead to step 16:
221 can be fit into 1790 8 times, resulting in a remainder of 22.
Use 8 as the next digit of our solution. 
Result so far: 329853.59276018
Deduct 1768 from 1790 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

After the division, we end up with 329853.59276018 and a remainder of 2.2e-08.