Let's divide 421243 by 54
Let's see how many times 54 fits into 421243.

Going ahead to step 1:
If we divide 4 by 54, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 54

Moving on to step 2:
54 goes into 42 0 times with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Fetch the next digit (1) from the dividend, attach it to 42 and continue: 421 / 54

Advancing to step 3:
54 can be fit into 421 7 times, resulting in a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we subtract 378 from 421, we get 43.
Include the next digit (2) from the dividend after 43, then repeat: 432 / 54

On to step 4:
432 divided by 54 is 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 78.0
If we take 432 away from 432, we end up with 0.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 54

Going ahead to step 5:
4 divided by 54 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 780.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 54

Let's proceed to step 6:
54 can be fit into 43 0 times, resulting in a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 7800.0
If we subtract 0 from 43, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
The number 54 fits into 430 7 times, leaving a remainder of 52.
Use 7 as the next digit of our solution. 
Result so far: 7800.7
If we take 378 away from 430, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 8:
54 goes into 520 9 times with a remainder of 34.
The number 9 becomes the next digit in our result. 
Result so far: 7800.79
The remainder is 34 after subtracting 486 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 9:
When dividing 340 by 54, we get 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 7800.796
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 10:
When dividing 160 by 54, we get 2 with a remainder of 52.
The number 2 becomes the next digit in our result. 
Result so far: 7800.7962
If we take 108 away from 160, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 11:
520 divided by 54 is 9 with a remainder of 34.
The next digit of our result is 9. 
Result so far: 7800.79629
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 12:
If we divide 340 by 54, we get 6 and a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 7800.796296
If we take 324 away from 340, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 13:
54 goes into 160 2 times with a remainder of 52.
Write down 2 as next digit of the result. 
Result so far: 7800.7962962
If we subtract 108 from 160, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 14:
54 goes into 520 9 times with a remainder of 34.
Record the quotient 9 as the next digit in the result. 
Result so far: 7800.79629629
Deduct 486 from 520 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The final result is 7800.79629629 with a remainder of 3.4e-08.