We divide 94030309 by 81
The aim is to understand the frequency of 81 in 94030309.

Step 1:
When dividing 9 by 81, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 81

On to step 2:
94 divided by 81 is 1 with a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 81 from 94 to get 13.
Append the next digit (0) from the dividend to 13 and continue with: 130 / 81

Step 3:
81 goes into 130 1 times with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we take 81 away from 130, we end up with 49.
Take the next digit (3) from the dividend and append it to 49, then repeat: 493 / 81

Advancing to step 4:
The number 81 fits into 493 6 times, leaving a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 116.0
The remainder is 7 after subtracting 486 from 493.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 81

Let's proceed to step 5:
When dividing 70 by 81, we get 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 1160.0
Subtract 0 from 70 to get 70.
Append the next digit (3) from the dividend to 70 and continue with: 703 / 81

Let's proceed to step 6:
If we divide 703 by 81, we get 8 and a remainder of 55.
The number 8 becomes the next digit in our result. 
Result so far: 11608.0
The remainder is 55 after subtracting 648 from 703.
Grab the next digit (0) from the dividend, add it to 55, then carry on: 550 / 81

Moving on to step 7:
The number 81 fits into 550 6 times, leaving a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 116086.0
Subtracting 486 from 550 leaves us with 64.
Bring next digit (9) of the dividend behind the 64 and repeat the process: 649 / 81

Let's proceed to step 8:
The number 81 fits into 649 8 times, leaving a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 1160868.0
If we take 648 away from 649, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
81 goes into 10 0 times with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 1160868.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
When dividing 100 by 81, we get 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1160868.01
If we take 81 away from 100, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 11:
If we divide 190 by 81, we get 2 and a remainder of 28.
The next digit of our result is 2. 
Result so far: 1160868.012
If we take 162 away from 190, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 12:
The number 81 fits into 280 3 times, leaving a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 1160868.0123
If we take 243 away from 280, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 13:
81 goes into 370 4 times with a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 1160868.01234
If we subtract 324 from 370, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 14:
The number 81 fits into 460 5 times, leaving a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 1160868.012345
Deduct 405 from 460 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 15:
The number 81 fits into 550 6 times, leaving a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 1160868.0123456
Subtract 486 from 550 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 16:
The number 81 fits into 640 7 times, leaving a remainder of 73.
Record the quotient 7 as the next digit in the result. 
Result so far: 1160868.01234567
Deduct 567 from 640 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

The final result is 1160868.01234567 with a remainder of 7.3e-08.