31239339 ÷ 721 
The aim is to understand the frequency of 721 in 31239339.

Advancing to step 1:
721 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 721

Let's proceed to step 2:
31 divided by 721 is 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Take the next digit (2) from the dividend and append it to 31, then repeat: 312 / 721

Let's proceed to step 3:
721 can be fit into 312 0 times, resulting in a remainder of 312.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 312 to get 312.
Append the next digit (3) from the dividend to 312 and continue with: 3123 / 721

Step 4:
When dividing 3123 by 721, we get 4 with a remainder of 239.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 2884 from 3123 to get 239.
Take the next digit (9) from the dividend and append it to 239, then repeat: 2399 / 721

Step 5:
721 goes into 2399 3 times with a remainder of 236.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we subtract 2163 from 2399, we get 236.
Bring next digit (3) of the dividend behind the 236 and repeat the process: 2363 / 721

Advancing to step 6:
721 goes into 2363 3 times with a remainder of 200.
The next digit of our result is 3. 
Result so far: 433.0
Subtracting 2163 from 2363 leaves us with 200.
Fetch the next digit (3) from the dividend, attach it to 200 and continue: 2003 / 721

Moving on to step 7:
The number 721 fits into 2003 2 times, leaving a remainder of 561.
Record the quotient 2 as the next digit in the result. 
Result so far: 4332.0
If we take 1442 away from 2003, we end up with 561.
Bring next digit (9) of the dividend behind the 561 and repeat the process: 5619 / 721

On to step 8:
When dividing 5619 by 721, we get 7 with a remainder of 572.
Put 7 as the next digit of the answer. 
Result so far: 43327.0
Subtract 5047 from 5619 to get 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Step 9:
When dividing 5720 by 721, we get 7 with a remainder of 673.
Write down 7 as next digit of the result. 
Result so far: 43327.7
If we subtract 5047 from 5720, we get 673.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6730, and continue the process.

Let's proceed to step 10:
721 can be fit into 6730 9 times, resulting in a remainder of 241.
Record the quotient 9 as the next digit in the result. 
Result so far: 43327.79
If we take 6489 away from 6730, we end up with 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Moving on to step 11:
721 goes into 2410 3 times with a remainder of 247.
Write down 3 as next digit of the result. 
Result so far: 43327.793
Deduct 2163 from 2410 and we're left with 247.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

Moving on to step 12:
2470 divided by 721 is 3 with a remainder of 307.
The next digit of our result is 3. 
Result so far: 43327.7933
Deduct 2163 from 2470 and we're left with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

The quotient of the division is 43327.7933, and the remainder is 0.00307.