We're dividing 57142353 by 721 
The aim is to understand the frequency of 721 in 57142353.

Step 1:
5 divided by 721 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 721

Step 2:
If we divide 57 by 721, we get 0 and a remainder of 57.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Grab the next digit (1) from the dividend, add it to 57, then carry on: 571 / 721

Step 3:
571 divided by 721 is 0 with a remainder of 571.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 571 and we're left with 571.
Take the next digit (4) from the dividend and append it to 571, then repeat: 5714 / 721

Let's proceed to step 4:
The number 721 fits into 5714 7 times, leaving a remainder of 667.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 5047 from 5714 to get 667.
Include the next digit (2) from the dividend after 667, then repeat: 6672 / 721

Step 5:
When dividing 6672 by 721, we get 9 with a remainder of 183.
Write down 9 as next digit of the result. 
Result so far: 79.0
Subtracting 6489 from 6672 leaves us with 183.
Fetch the next digit (3) from the dividend, attach it to 183 and continue: 1833 / 721

Going ahead to step 6:
721 goes into 1833 2 times with a remainder of 391.
Use 2 as the next digit of our solution. 
Result so far: 792.0
Deduct 1442 from 1833 and we're left with 391.
Take the next digit (5) from the dividend and append it to 391, then repeat: 3915 / 721

Going ahead to step 7:
If we divide 3915 by 721, we get 5 and a remainder of 310.
Use 5 as the next digit of our solution. 
Result so far: 7925.0
Subtract 3605 from 3915 to get 310.
Take the next digit (3) from the dividend and append it to 310, then repeat: 3103 / 721

Advancing to step 8:
721 can be fit into 3103 4 times, resulting in a remainder of 219.
Put 4 as the next digit of the answer. 
Result so far: 79254.0
Subtract 2884 from 3103 to get 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Going ahead to step 9:
721 can be fit into 2190 3 times, resulting in a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 79254.3
If we take 2163 away from 2190, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 10:
When dividing 270 by 721, we get 0 with a remainder of 270.
The number 0 becomes the next digit in our result. 
Result so far: 79254.3
The remainder is 270 after subtracting 0 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 11:
The number 721 fits into 2700 3 times, leaving a remainder of 537.
The number 3 becomes the next digit in our result. 
Result so far: 79254.303
If we take 2163 away from 2700, we end up with 537.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5370, and continue the process.

Advancing to step 12:
The number 721 fits into 5370 7 times, leaving a remainder of 323.
The next digit of our result is 7. 
Result so far: 79254.3037
Subtract 5047 from 5370 to get 323.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3230, and continue the process.

Let's proceed to step 13:
The number 721 fits into 3230 4 times, leaving a remainder of 346.
Put 4 as the next digit of the answer. 
Result so far: 79254.30374
Subtracting 2884 from 3230 leaves us with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

On to step 14:
721 can be fit into 3460 4 times, resulting in a remainder of 576.
Record the quotient 4 as the next digit in the result. 
Result so far: 79254.303744
Deduct 2884 from 3460 and we're left with 576.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

The final result is 79254.303744 with a remainder of 5.76e-05.