12572206 ÷ 721 
The aim is to understand the frequency of 721 in 12572206.

Advancing to step 1:
If we divide 1 by 721, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 721

Advancing to step 2:
721 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 721

Let's proceed to step 3:
721 goes into 125 0 times with a remainder of 125.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 125 after subtracting 0 from 125.
Bring next digit (7) of the dividend behind the 125 and repeat the process: 1257 / 721

Advancing to step 4:
1257 divided by 721 is 1 with a remainder of 536.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 721 from 1257 leaves us with 536.
Include the next digit (2) from the dividend after 536, then repeat: 5362 / 721

Moving on to step 5:
721 goes into 5362 7 times with a remainder of 315.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we subtract 5047 from 5362, we get 315.
Include the next digit (2) from the dividend after 315, then repeat: 3152 / 721

Moving on to step 6:
721 goes into 3152 4 times with a remainder of 268.
Use 4 as the next digit of our solution. 
Result so far: 174.0
Deduct 2884 from 3152 and we're left with 268.
Include the next digit (0) from the dividend after 268, then repeat: 2680 / 721

Advancing to step 7:
721 can be fit into 2680 3 times, resulting in a remainder of 517.
Record the quotient 3 as the next digit in the result. 
Result so far: 1743.0
Subtracting 2163 from 2680 leaves us with 517.
Include the next digit (6) from the dividend after 517, then repeat: 5176 / 721

Advancing to step 8:
721 can be fit into 5176 7 times, resulting in a remainder of 129.
The number 7 becomes the next digit in our result. 
Result so far: 17437.0
Subtract 5047 from 5176 to get 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Let's proceed to step 9:
When dividing 1290 by 721, we get 1 with a remainder of 569.
Use 1 as the next digit of our solution. 
Result so far: 17437.1
Subtracting 721 from 1290 leaves us with 569.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5690, and continue the process.

Let's proceed to step 10:
5690 divided by 721 is 7 with a remainder of 643.
Write down 7 as next digit of the result. 
Result so far: 17437.17
Subtracting 5047 from 5690 leaves us with 643.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6430, and continue the process.

Moving on to step 11:
When dividing 6430 by 721, we get 8 with a remainder of 662.
Record the quotient 8 as the next digit in the result. 
Result so far: 17437.178
Subtract 5768 from 6430 to get 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Let's proceed to step 12:
721 can be fit into 6620 9 times, resulting in a remainder of 131.
Record the quotient 9 as the next digit in the result. 
Result so far: 17437.1789
If we take 6489 away from 6620, we end up with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Let's proceed to step 13:
1310 divided by 721 is 1 with a remainder of 589.
Record the quotient 1 as the next digit in the result. 
Result so far: 17437.17891
If we take 721 away from 1310, we end up with 589.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5890, and continue the process.

On to step 14:
721 goes into 5890 8 times with a remainder of 122.
Record the quotient 8 as the next digit in the result. 
Result so far: 17437.178918
Deduct 5768 from 5890 and we're left with 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Moving on to step 15:
721 goes into 1220 1 times with a remainder of 499.
Write down 1 as next digit of the result. 
Result so far: 17437.1789181
The remainder is 499 after subtracting 721 from 1220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Moving on to step 16:
The number 721 fits into 4990 6 times, leaving a remainder of 664.
Use 6 as the next digit of our solution. 
Result so far: 17437.17891816
Deduct 4326 from 4990 and we're left with 664.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6640, and continue the process.

The final outcome is 17437.17891816, with a leftover of 6.64e-07.