9100990 divided by 250 
The aim is to understand the frequency of 250 in 9100990.

Advancing to step 1:
250 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 250

Going ahead to step 2:
The number 250 fits into 91 0 times, leaving a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Grab the next digit (0) from the dividend, add it to 91, then carry on: 910 / 250

Step 3:
If we divide 910 by 250, we get 3 and a remainder of 160.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 160 after subtracting 750 from 910.
Take the next digit (0) from the dividend and append it to 160, then repeat: 1600 / 250

Let's proceed to step 4:
250 can be fit into 1600 6 times, resulting in a remainder of 100.
Write down 6 as next digit of the result. 
Result so far: 36.0
Subtract 1500 from 1600 to get 100.
Grab the next digit (9) from the dividend, add it to 100, then carry on: 1009 / 250

On to step 5:
250 goes into 1009 4 times with a remainder of 9.
Put 4 as the next digit of the answer. 
Result so far: 364.0
Subtract 1000 from 1009 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 250

Advancing to step 6:
250 goes into 99 0 times with a remainder of 99.
Put 0 as the next digit of the answer. 
Result so far: 3640.0
If we subtract 0 from 99, we get 99.
Bring next digit (0) of the dividend behind the 99 and repeat the process: 990 / 250

Let's proceed to step 7:
When dividing 990 by 250, we get 3 with a remainder of 240.
Use 3 as the next digit of our solution. 
Result so far: 36403.0
Deduct 750 from 990 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 8:
The number 250 fits into 2400 9 times, leaving a remainder of 150.
Put 9 as the next digit of the answer. 
Result so far: 36403.9
If we take 2250 away from 2400, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 9:
250 can be fit into 1500 6 times, resulting in a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 36403.96
The remainder is 0 after subtracting 1500 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
The number 250 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 36403.96
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
When dividing 0 by 250, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 36403.96
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 36403.96 and a remainder of 0.0.