We look at the division of 53618240 by 423 
The aim is to understand the frequency of 423 in 53618240.

On to step 1:
If we divide 5 by 423, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 423

Step 2:
The number 423 fits into 53 0 times, leaving a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Append the next digit (6) from the dividend to 53 and continue with: 536 / 423

Let's proceed to step 3:
The number 423 fits into 536 1 times, leaving a remainder of 113.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 423 from 536, we get 113.
Include the next digit (1) from the dividend after 113, then repeat: 1131 / 423

On to step 4:
423 goes into 1131 2 times with a remainder of 285.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 846 away from 1131, we end up with 285.
Fetch the next digit (8) from the dividend, attach it to 285 and continue: 2858 / 423

Let's proceed to step 5:
423 goes into 2858 6 times with a remainder of 320.
The number 6 becomes the next digit in our result. 
Result so far: 126.0
Subtract 2538 from 2858 to get 320.
Grab the next digit (2) from the dividend, add it to 320, then carry on: 3202 / 423

Moving on to step 6:
3202 divided by 423 is 7 with a remainder of 241.
The next digit of our result is 7. 
Result so far: 1267.0
Deduct 2961 from 3202 and we're left with 241.
Grab the next digit (4) from the dividend, add it to 241, then carry on: 2414 / 423

Advancing to step 7:
When dividing 2414 by 423, we get 5 with a remainder of 299.
The next digit of our result is 5. 
Result so far: 12675.0
Subtract 2115 from 2414 to get 299.
Include the next digit (0) from the dividend after 299, then repeat: 2990 / 423

Let's proceed to step 8:
When dividing 2990 by 423, we get 7 with a remainder of 29.
The number 7 becomes the next digit in our result. 
Result so far: 126757.0
If we subtract 2961 from 2990, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 9:
When dividing 290 by 423, we get 0 with a remainder of 290.
The next digit of our result is 0. 
Result so far: 126757.0
Subtract 0 from 290 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 10:
If we divide 2900 by 423, we get 6 and a remainder of 362.
Use 6 as the next digit of our solution. 
Result so far: 126757.06
Subtracting 2538 from 2900 leaves us with 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

On to step 11:
The number 423 fits into 3620 8 times, leaving a remainder of 236.
Write down 8 as next digit of the result. 
Result so far: 126757.068
If we subtract 3384 from 3620, we get 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

On to step 12:
2360 divided by 423 is 5 with a remainder of 245.
Write down 5 as next digit of the result. 
Result so far: 126757.0685
Subtracting 2115 from 2360 leaves us with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Going ahead to step 13:
423 goes into 2450 5 times with a remainder of 335.
Write down 5 as next digit of the result. 
Result so far: 126757.06855
If we take 2115 away from 2450, we end up with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

The quotient of the division is 126757.06855, and the remainder is 0.000335.