We divide 71981518 by 728
The aim is to understand the frequency of 728 in 71981518.

Moving on to step 1:
The number 728 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 728

Advancing to step 2:
If we divide 71 by 728, we get 0 and a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 71 leaves us with 71.
Bring next digit (9) of the dividend behind the 71 and repeat the process: 719 / 728

Step 3:
728 can be fit into 719 0 times, resulting in a remainder of 719.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 719 to get 719.
Grab the next digit (8) from the dividend, add it to 719, then carry on: 7198 / 728

Moving on to step 4:
When dividing 7198 by 728, we get 9 with a remainder of 646.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 6552 from 7198, we get 646.
Fetch the next digit (1) from the dividend, attach it to 646 and continue: 6461 / 728

Step 5:
728 can be fit into 6461 8 times, resulting in a remainder of 637.
Put 8 as the next digit of the answer. 
Result so far: 98.0
If we take 5824 away from 6461, we end up with 637.
Take the next digit (5) from the dividend and append it to 637, then repeat: 6375 / 728

Let's proceed to step 6:
If we divide 6375 by 728, we get 8 and a remainder of 551.
Put 8 as the next digit of the answer. 
Result so far: 988.0
If we take 5824 away from 6375, we end up with 551.
Take the next digit (1) from the dividend and append it to 551, then repeat: 5511 / 728

Step 7:
When dividing 5511 by 728, we get 7 with a remainder of 415.
Record the quotient 7 as the next digit in the result. 
Result so far: 9887.0
If we take 5096 away from 5511, we end up with 415.
Fetch the next digit (8) from the dividend, attach it to 415 and continue: 4158 / 728

Step 8:
728 can be fit into 4158 5 times, resulting in a remainder of 518.
The number 5 becomes the next digit in our result. 
Result so far: 98875.0
Subtracting 3640 from 4158 leaves us with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Moving on to step 9:
The number 728 fits into 5180 7 times, leaving a remainder of 84.
The next digit of our result is 7. 
Result so far: 98875.7
If we subtract 5096 from 5180, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Let's proceed to step 10:
If we divide 840 by 728, we get 1 and a remainder of 112.
Record the quotient 1 as the next digit in the result. 
Result so far: 98875.71
Subtract 728 from 840 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Going ahead to step 11:
728 can be fit into 1120 1 times, resulting in a remainder of 392.
Record the quotient 1 as the next digit in the result. 
Result so far: 98875.711
If we take 728 away from 1120, we end up with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

After the division, we end up with 98875.711 and a remainder of 0.0392.