We're dividing 54212425 by 420 
Let's see how many times 420 fits into 54212425.

Advancing to step 1:
420 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 420

Advancing to step 2:
420 can be fit into 54 0 times, resulting in a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 54 after subtracting 0 from 54.
Append the next digit (2) from the dividend to 54 and continue with: 542 / 420

Going ahead to step 3:
If we divide 542 by 420, we get 1 and a remainder of 122.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 420 away from 542, we end up with 122.
Include the next digit (1) from the dividend after 122, then repeat: 1221 / 420

Step 4:
If we divide 1221 by 420, we get 2 and a remainder of 381.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 840 from 1221 to get 381.
Take the next digit (2) from the dividend and append it to 381, then repeat: 3812 / 420

Moving on to step 5:
420 goes into 3812 9 times with a remainder of 32.
The next digit of our result is 9. 
Result so far: 129.0
Subtracting 3780 from 3812 leaves us with 32.
Include the next digit (4) from the dividend after 32, then repeat: 324 / 420

Let's proceed to step 6:
324 divided by 420 is 0 with a remainder of 324.
Record the quotient 0 as the next digit in the result. 
Result so far: 1290.0
If we subtract 0 from 324, we get 324.
Bring next digit (2) of the dividend behind the 324 and repeat the process: 3242 / 420

Step 7:
420 goes into 3242 7 times with a remainder of 302.
Use 7 as the next digit of our solution. 
Result so far: 12907.0
Subtract 2940 from 3242 to get 302.
Bring next digit (5) of the dividend behind the 302 and repeat the process: 3025 / 420

Advancing to step 8:
When dividing 3025 by 420, we get 7 with a remainder of 85.
Put 7 as the next digit of the answer. 
Result so far: 129077.0
Deduct 2940 from 3025 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 9:
850 divided by 420 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 129077.2
If we take 840 away from 850, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
100 divided by 420 is 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 129077.2
Subtracting 0 from 100 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 11:
When dividing 1000 by 420, we get 2 with a remainder of 160.
Use 2 as the next digit of our solution. 
Result so far: 129077.202
The remainder is 160 after subtracting 840 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 12:
When dividing 1600 by 420, we get 3 with a remainder of 340.
The next digit of our result is 3. 
Result so far: 129077.2023
If we take 1260 away from 1600, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 13:
420 goes into 3400 8 times with a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 129077.20238
Subtract 3360 from 3400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 14:
400 divided by 420 is 0 with a remainder of 400.
The next digit of our result is 0. 
Result so far: 129077.20238
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 15:
If we divide 4000 by 420, we get 9 and a remainder of 220.
The next digit of our result is 9. 
Result so far: 129077.2023809
Deduct 3780 from 4000 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 16:
420 can be fit into 2200 5 times, resulting in a remainder of 100.
The number 5 becomes the next digit in our result. 
Result so far: 129077.20238095
Deduct 2100 from 2200 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final result is 129077.20238095 with a remainder of 1e-07.