We look at the division of 91000507 by 444 
The aim is to understand the frequency of 444 in 91000507.

On to step 1:
If we divide 9 by 444, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 444

On to step 2:
When dividing 91 by 444, we get 0 with a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 91 leaves us with 91.
Include the next digit (0) from the dividend after 91, then repeat: 910 / 444

Advancing to step 3:
The number 444 fits into 910 2 times, leaving a remainder of 22.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 888 from 910 leaves us with 22.
Take the next digit (0) from the dividend and append it to 22, then repeat: 220 / 444

Going ahead to step 4:
The number 444 fits into 220 0 times, leaving a remainder of 220.
Use 0 as the next digit of our solution. 
Result so far: 20.0
The remainder is 220 after subtracting 0 from 220.
Grab the next digit (0) from the dividend, add it to 220, then carry on: 2200 / 444

Moving on to step 5:
If we divide 2200 by 444, we get 4 and a remainder of 424.
The number 4 becomes the next digit in our result. 
Result so far: 204.0
Deduct 1776 from 2200 and we're left with 424.
Append the next digit (5) from the dividend to 424 and continue with: 4245 / 444

Let's proceed to step 6:
444 goes into 4245 9 times with a remainder of 249.
The next digit of our result is 9. 
Result so far: 2049.0
If we take 3996 away from 4245, we end up with 249.
Bring next digit (0) of the dividend behind the 249 and repeat the process: 2490 / 444

Advancing to step 7:
If we divide 2490 by 444, we get 5 and a remainder of 270.
Use 5 as the next digit of our solution. 
Result so far: 20495.0
If we subtract 2220 from 2490, we get 270.
Bring next digit (7) of the dividend behind the 270 and repeat the process: 2707 / 444

On to step 8:
The number 444 fits into 2707 6 times, leaving a remainder of 43.
Record the quotient 6 as the next digit in the result. 
Result so far: 204956.0
If we subtract 2664 from 2707, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
The number 444 fits into 430 0 times, leaving a remainder of 430.
Write down 0 as next digit of the result. 
Result so far: 204956.0
Deduct 0 from 430 and we're left with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 10:
If we divide 4300 by 444, we get 9 and a remainder of 304.
Use 9 as the next digit of our solution. 
Result so far: 204956.09
The remainder is 304 after subtracting 3996 from 4300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Let's proceed to step 11:
444 goes into 3040 6 times with a remainder of 376.
The next digit of our result is 6. 
Result so far: 204956.096
If we take 2664 away from 3040, we end up with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Moving on to step 12:
3760 divided by 444 is 8 with a remainder of 208.
The next digit of our result is 8. 
Result so far: 204956.0968
Subtracting 3552 from 3760 leaves us with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Step 13:
The number 444 fits into 2080 4 times, leaving a remainder of 304.
Record the quotient 4 as the next digit in the result. 
Result so far: 204956.09684
If we take 1776 away from 2080, we end up with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

On to step 14:
The number 444 fits into 3040 6 times, leaving a remainder of 376.
The number 6 becomes the next digit in our result. 
Result so far: 204956.096846
If we take 2664 away from 3040, we end up with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

On to step 15:
444 can be fit into 3760 8 times, resulting in a remainder of 208.
Use 8 as the next digit of our solution. 
Result so far: 204956.0968468
Subtract 3552 from 3760 to get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 16:
When dividing 2080 by 444, we get 4 with a remainder of 304.
Record the quotient 4 as the next digit in the result. 
Result so far: 204956.09684684
The remainder is 304 after subtracting 1776 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

After the division, we end up with 204956.09684684 and a remainder of 3.04e-07.