76903000 ÷ 503 
The aim is to understand the frequency of 503 in 76903000.

Let's proceed to step 1:
503 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 503

Going ahead to step 2:
503 goes into 76 0 times with a remainder of 76.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 76 and we're left with 76.
Grab the next digit (9) from the dividend, add it to 76, then carry on: 769 / 503

Advancing to step 3:
The number 503 fits into 769 1 times, leaving a remainder of 266.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 503 from 769 and we're left with 266.
Grab the next digit (0) from the dividend, add it to 266, then carry on: 2660 / 503

Let's proceed to step 4:
If we divide 2660 by 503, we get 5 and a remainder of 145.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 2515 from 2660 to get 145.
Include the next digit (3) from the dividend after 145, then repeat: 1453 / 503

Going ahead to step 5:
The number 503 fits into 1453 2 times, leaving a remainder of 447.
The number 2 becomes the next digit in our result. 
Result so far: 152.0
If we subtract 1006 from 1453, we get 447.
Take the next digit (0) from the dividend and append it to 447, then repeat: 4470 / 503

Let's proceed to step 6:
When dividing 4470 by 503, we get 8 with a remainder of 446.
The number 8 becomes the next digit in our result. 
Result so far: 1528.0
Subtracting 4024 from 4470 leaves us with 446.
Fetch the next digit (0) from the dividend, attach it to 446 and continue: 4460 / 503

Going ahead to step 7:
503 goes into 4460 8 times with a remainder of 436.
The next digit of our result is 8. 
Result so far: 15288.0
The remainder is 436 after subtracting 4024 from 4460.
Bring next digit (0) of the dividend behind the 436 and repeat the process: 4360 / 503

On to step 8:
The number 503 fits into 4360 8 times, leaving a remainder of 336.
The number 8 becomes the next digit in our result. 
Result so far: 152888.0
The remainder is 336 after subtracting 4024 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Moving on to step 9:
3360 divided by 503 is 6 with a remainder of 342.
Write down 6 as next digit of the result. 
Result so far: 152888.6
If we take 3018 away from 3360, we end up with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Step 10:
When dividing 3420 by 503, we get 6 with a remainder of 402.
Write down 6 as next digit of the result. 
Result so far: 152888.66
The remainder is 402 after subtracting 3018 from 3420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

After the division, we end up with 152888.66 and a remainder of 0.402.