54783976 divided by 421 
The aim is to understand the frequency of 421 in 54783976.

Advancing to step 1:
When dividing 5 by 421, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 421

Advancing to step 2:
421 goes into 54 0 times with a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Include the next digit (7) from the dividend after 54, then repeat: 547 / 421

Step 3:
421 goes into 547 1 times with a remainder of 126.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 421 from 547 and we're left with 126.
Include the next digit (8) from the dividend after 126, then repeat: 1268 / 421

Let's proceed to step 4:
When dividing 1268 by 421, we get 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Deduct 1263 from 1268 and we're left with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 421

Let's proceed to step 5:
When dividing 53 by 421, we get 0 with a remainder of 53.
Record the quotient 0 as the next digit in the result. 
Result so far: 130.0
If we take 0 away from 53, we end up with 53.
Append the next digit (9) from the dividend to 53 and continue with: 539 / 421

Going ahead to step 6:
421 goes into 539 1 times with a remainder of 118.
Use 1 as the next digit of our solution. 
Result so far: 1301.0
Deduct 421 from 539 and we're left with 118.
Fetch the next digit (7) from the dividend, attach it to 118 and continue: 1187 / 421

Going ahead to step 7:
421 goes into 1187 2 times with a remainder of 345.
Put 2 as the next digit of the answer. 
Result so far: 13012.0
Subtract 842 from 1187 to get 345.
Take the next digit (6) from the dividend and append it to 345, then repeat: 3456 / 421

Advancing to step 8:
The number 421 fits into 3456 8 times, leaving a remainder of 88.
Write down 8 as next digit of the result. 
Result so far: 130128.0
Subtract 3368 from 3456 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 9:
If we divide 880 by 421, we get 2 and a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 130128.2
Subtracting 842 from 880 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
421 can be fit into 380 0 times, resulting in a remainder of 380.
The next digit of our result is 0. 
Result so far: 130128.2
Deduct 0 from 380 and we're left with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 11:
3800 divided by 421 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 130128.209
If we subtract 3789 from 3800, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 12:
421 goes into 110 0 times with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 130128.209
Subtract 0 from 110 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 13:
421 can be fit into 1100 2 times, resulting in a remainder of 258.
The next digit of our result is 2. 
Result so far: 130128.20902
Subtract 842 from 1100 to get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Going ahead to step 14:
When dividing 2580 by 421, we get 6 with a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 130128.209026
Subtracting 2526 from 2580 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 15:
When dividing 540 by 421, we get 1 with a remainder of 119.
Write down 1 as next digit of the result. 
Result so far: 130128.2090261
Subtracting 421 from 540 leaves us with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 16:
If we divide 1190 by 421, we get 2 and a remainder of 348.
Use 2 as the next digit of our solution. 
Result so far: 130128.20902612
Deduct 842 from 1190 and we're left with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

After the division, we end up with 130128.20902612 and a remainder of 3.48e-07.