We're dividing 5520351 by 721 
The aim is to understand the frequency of 721 in 5520351.

Step 1:
721 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 721

Let's proceed to step 2:
When dividing 55 by 721, we get 0 with a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 55 and we're left with 55.
Take the next digit (2) from the dividend and append it to 55, then repeat: 552 / 721

Going ahead to step 3:
The number 721 fits into 552 0 times, leaving a remainder of 552.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 552 and we're left with 552.
Include the next digit (0) from the dividend after 552, then repeat: 5520 / 721

Advancing to step 4:
721 can be fit into 5520 7 times, resulting in a remainder of 473.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 473 after subtracting 5047 from 5520.
Append the next digit (3) from the dividend to 473 and continue with: 4733 / 721

Step 5:
721 goes into 4733 6 times with a remainder of 407.
Use 6 as the next digit of our solution. 
Result so far: 76.0
Subtract 4326 from 4733 to get 407.
Include the next digit (5) from the dividend after 407, then repeat: 4075 / 721

On to step 6:
When dividing 4075 by 721, we get 5 with a remainder of 470.
Use 5 as the next digit of our solution. 
Result so far: 765.0
Deduct 3605 from 4075 and we're left with 470.
Grab the next digit (1) from the dividend, add it to 470, then carry on: 4701 / 721

Moving on to step 7:
4701 divided by 721 is 6 with a remainder of 375.
The number 6 becomes the next digit in our result. 
Result so far: 7656.0
Deduct 4326 from 4701 and we're left with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Moving on to step 8:
721 goes into 3750 5 times with a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 7656.5
Subtract 3605 from 3750 to get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Moving on to step 9:
The number 721 fits into 1450 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 7656.52
Subtracting 1442 from 1450 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 10:
721 can be fit into 80 0 times, resulting in a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 7656.52
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 11:
800 divided by 721 is 1 with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 7656.5201
If we take 721 away from 800, we end up with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 12:
If we divide 790 by 721, we get 1 and a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 7656.52011
Subtracting 721 from 790 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

In conclusion, the division gives 7656.52011 with a balance of 6.9e-05.