We look at the division of 24217731 by 721 
The aim is to understand the frequency of 721 in 24217731.

Going ahead to step 1:
721 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 721

Advancing to step 2:
24 divided by 721 is 0 with a remainder of 24.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 24 and we're left with 24.
Append the next digit (2) from the dividend to 24 and continue with: 242 / 721

Going ahead to step 3:
242 divided by 721 is 0 with a remainder of 242.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 242 to get 242.
Append the next digit (1) from the dividend to 242 and continue with: 2421 / 721

Step 4:
721 goes into 2421 3 times with a remainder of 258.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 2163 from 2421, we get 258.
Bring next digit (7) of the dividend behind the 258 and repeat the process: 2587 / 721

Moving on to step 5:
The number 721 fits into 2587 3 times, leaving a remainder of 424.
Write down 3 as next digit of the result. 
Result so far: 33.0
Subtracting 2163 from 2587 leaves us with 424.
Append the next digit (7) from the dividend to 424 and continue with: 4247 / 721

Advancing to step 6:
721 can be fit into 4247 5 times, resulting in a remainder of 642.
The next digit of our result is 5. 
Result so far: 335.0
If we subtract 3605 from 4247, we get 642.
Grab the next digit (3) from the dividend, add it to 642, then carry on: 6423 / 721

Going ahead to step 7:
6423 divided by 721 is 8 with a remainder of 655.
The number 8 becomes the next digit in our result. 
Result so far: 3358.0
Subtracting 5768 from 6423 leaves us with 655.
Bring next digit (1) of the dividend behind the 655 and repeat the process: 6551 / 721

Advancing to step 8:
721 can be fit into 6551 9 times, resulting in a remainder of 62.
The next digit of our result is 9. 
Result so far: 33589.0
If we subtract 6489 from 6551, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 9:
The number 721 fits into 620 0 times, leaving a remainder of 620.
Write down 0 as next digit of the result. 
Result so far: 33589.0
If we take 0 away from 620, we end up with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Step 10:
When dividing 6200 by 721, we get 8 with a remainder of 432.
The number 8 becomes the next digit in our result. 
Result so far: 33589.08
Subtracting 5768 from 6200 leaves us with 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Step 11:
721 can be fit into 4320 5 times, resulting in a remainder of 715.
Use 5 as the next digit of our solution. 
Result so far: 33589.085
If we subtract 3605 from 4320, we get 715.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7150, and continue the process.

Advancing to step 12:
721 goes into 7150 9 times with a remainder of 661.
Write down 9 as next digit of the result. 
Result so far: 33589.0859
If we subtract 6489 from 7150, we get 661.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6610, and continue the process.

Advancing to step 13:
The number 721 fits into 6610 9 times, leaving a remainder of 121.
The next digit of our result is 9. 
Result so far: 33589.08599
If we take 6489 away from 6610, we end up with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

The final result is 33589.08599 with a remainder of 0.000121.