53601961 divided by 903 
The aim is to understand the frequency of 903 in 53601961.

Step 1:
If we divide 5 by 903, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 903

Moving on to step 2:
The number 903 fits into 53 0 times, leaving a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Append the next digit (6) from the dividend to 53 and continue with: 536 / 903

Moving on to step 3:
When dividing 536 by 903, we get 0 with a remainder of 536.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 536 and we're left with 536.
Bring next digit (0) of the dividend behind the 536 and repeat the process: 5360 / 903

Going ahead to step 4:
If we divide 5360 by 903, we get 5 and a remainder of 845.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 4515 from 5360 leaves us with 845.
Grab the next digit (1) from the dividend, add it to 845, then carry on: 8451 / 903

Moving on to step 5:
The number 903 fits into 8451 9 times, leaving a remainder of 324.
Use 9 as the next digit of our solution. 
Result so far: 59.0
Subtract 8127 from 8451 to get 324.
Bring next digit (9) of the dividend behind the 324 and repeat the process: 3249 / 903

On to step 6:
If we divide 3249 by 903, we get 3 and a remainder of 540.
Put 3 as the next digit of the answer. 
Result so far: 593.0
The remainder is 540 after subtracting 2709 from 3249.
Grab the next digit (6) from the dividend, add it to 540, then carry on: 5406 / 903

Going ahead to step 7:
When dividing 5406 by 903, we get 5 with a remainder of 891.
The next digit of our result is 5. 
Result so far: 5935.0
Subtract 4515 from 5406 to get 891.
Fetch the next digit (1) from the dividend, attach it to 891 and continue: 8911 / 903

Let's proceed to step 8:
8911 divided by 903 is 9 with a remainder of 784.
The next digit of our result is 9. 
Result so far: 59359.0
The remainder is 784 after subtracting 8127 from 8911.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Going ahead to step 9:
If we divide 7840 by 903, we get 8 and a remainder of 616.
The number 8 becomes the next digit in our result. 
Result so far: 59359.8
The remainder is 616 after subtracting 7224 from 7840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

Going ahead to step 10:
The number 903 fits into 6160 6 times, leaving a remainder of 742.
The number 6 becomes the next digit in our result. 
Result so far: 59359.86
Subtract 5418 from 6160 to get 742.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7420, and continue the process.

Step 11:
The number 903 fits into 7420 8 times, leaving a remainder of 196.
Put 8 as the next digit of the answer. 
Result so far: 59359.868
The remainder is 196 after subtracting 7224 from 7420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Let's proceed to step 12:
If we divide 1960 by 903, we get 2 and a remainder of 154.
The number 2 becomes the next digit in our result. 
Result so far: 59359.8682
Deduct 1806 from 1960 and we're left with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Going ahead to step 13:
When dividing 1540 by 903, we get 1 with a remainder of 637.
The next digit of our result is 1. 
Result so far: 59359.86821
If we take 903 away from 1540, we end up with 637.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6370, and continue the process.

Step 14:
903 can be fit into 6370 7 times, resulting in a remainder of 49.
The number 7 becomes the next digit in our result. 
Result so far: 59359.868217
Subtract 6321 from 6370 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 15:
If we divide 490 by 903, we get 0 and a remainder of 490.
Use 0 as the next digit of our solution. 
Result so far: 59359.868217
Deduct 0 from 490 and we're left with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Moving on to step 16:
903 can be fit into 4900 5 times, resulting in a remainder of 385.
Record the quotient 5 as the next digit in the result. 
Result so far: 59359.86821705
Subtract 4515 from 4900 to get 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

After the division, we end up with 59359.86821705 and a remainder of 3.85e-07.