We're dividing 12837820 by 423 
The aim is to understand the frequency of 423 in 12837820.

Step 1:
If we divide 1 by 423, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 423

Let's proceed to step 2:
423 goes into 12 0 times with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 423

Step 3:
423 goes into 128 0 times with a remainder of 128.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 128, we end up with 128.
Include the next digit (3) from the dividend after 128, then repeat: 1283 / 423

Going ahead to step 4:
423 goes into 1283 3 times with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 14 after subtracting 1269 from 1283.
Include the next digit (7) from the dividend after 14, then repeat: 147 / 423

Advancing to step 5:
When dividing 147 by 423, we get 0 with a remainder of 147.
Write down 0 as next digit of the result. 
Result so far: 30.0
The remainder is 147 after subtracting 0 from 147.
Grab the next digit (8) from the dividend, add it to 147, then carry on: 1478 / 423

Let's proceed to step 6:
The number 423 fits into 1478 3 times, leaving a remainder of 209.
Put 3 as the next digit of the answer. 
Result so far: 303.0
If we subtract 1269 from 1478, we get 209.
Grab the next digit (2) from the dividend, add it to 209, then carry on: 2092 / 423

Going ahead to step 7:
423 goes into 2092 4 times with a remainder of 400.
Write down 4 as next digit of the result. 
Result so far: 3034.0
Subtracting 1692 from 2092 leaves us with 400.
Include the next digit (0) from the dividend after 400, then repeat: 4000 / 423

Step 8:
423 goes into 4000 9 times with a remainder of 193.
Write down 9 as next digit of the result. 
Result so far: 30349.0
Subtracting 3807 from 4000 leaves us with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Going ahead to step 9:
If we divide 1930 by 423, we get 4 and a remainder of 238.
Record the quotient 4 as the next digit in the result. 
Result so far: 30349.4
Deduct 1692 from 1930 and we're left with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Moving on to step 10:
The number 423 fits into 2380 5 times, leaving a remainder of 265.
Write down 5 as next digit of the result. 
Result so far: 30349.45
Deduct 2115 from 2380 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

On to step 11:
423 goes into 2650 6 times with a remainder of 112.
The number 6 becomes the next digit in our result. 
Result so far: 30349.456
Subtract 2538 from 2650 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 12:
423 goes into 1120 2 times with a remainder of 274.
The number 2 becomes the next digit in our result. 
Result so far: 30349.4562
Deduct 846 from 1120 and we're left with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

On to step 13:
If we divide 2740 by 423, we get 6 and a remainder of 202.
Write down 6 as next digit of the result. 
Result so far: 30349.45626
If we subtract 2538 from 2740, we get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Step 14:
423 can be fit into 2020 4 times, resulting in a remainder of 328.
Record the quotient 4 as the next digit in the result. 
Result so far: 30349.456264
The remainder is 328 after subtracting 1692 from 2020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Step 15:
423 goes into 3280 7 times with a remainder of 319.
The next digit of our result is 7. 
Result so far: 30349.4562647
Deduct 2961 from 3280 and we're left with 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

Advancing to step 16:
If we divide 3190 by 423, we get 7 and a remainder of 229.
The next digit of our result is 7. 
Result so far: 30349.45626477
Deduct 2961 from 3190 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

After the division, we end up with 30349.45626477 and a remainder of 2.29e-07.