21802048 ÷ 243 
Our goal is to divide 21802048 by 243.

On to step 1:
243 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 243

On to step 2:
The number 243 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 243

Step 3:
243 can be fit into 218 0 times, resulting in a remainder of 218.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 218 leaves us with 218.
Fetch the next digit (0) from the dividend, attach it to 218 and continue: 2180 / 243

Advancing to step 4:
The number 243 fits into 2180 8 times, leaving a remainder of 236.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 1944 from 2180 to get 236.
Take the next digit (2) from the dividend and append it to 236, then repeat: 2362 / 243

Step 5:
2362 divided by 243 is 9 with a remainder of 175.
Use 9 as the next digit of our solution. 
Result so far: 89.0
If we subtract 2187 from 2362, we get 175.
Include the next digit (0) from the dividend after 175, then repeat: 1750 / 243

Advancing to step 6:
When dividing 1750 by 243, we get 7 with a remainder of 49.
Write down 7 as next digit of the result. 
Result so far: 897.0
If we take 1701 away from 1750, we end up with 49.
Grab the next digit (4) from the dividend, add it to 49, then carry on: 494 / 243

Moving on to step 7:
If we divide 494 by 243, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 8972.0
Subtracting 486 from 494 leaves us with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 243

Going ahead to step 8:
88 divided by 243 is 0 with a remainder of 88.
Put 0 as the next digit of the answer. 
Result so far: 89720.0
Subtracting 0 from 88 leaves us with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 9:
880 divided by 243 is 3 with a remainder of 151.
Write down 3 as next digit of the result. 
Result so far: 89720.3
Subtract 729 from 880 to get 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Moving on to step 10:
1510 divided by 243 is 6 with a remainder of 52.
Use 6 as the next digit of our solution. 
Result so far: 89720.36
If we take 1458 away from 1510, 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.

On to step 11:
When dividing 520 by 243, we get 2 with a remainder of 34.
Write down 2 as next digit of the result. 
Result so far: 89720.362
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.

Going ahead to step 12:
340 divided by 243 is 1 with a remainder of 97.
Write down 1 as next digit of the result. 
Result so far: 89720.3621
Subtract 243 from 340 to get 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Let's proceed to step 13:
243 can be fit into 970 3 times, resulting in a remainder of 241.
The number 3 becomes the next digit in our result. 
Result so far: 89720.36213
If we subtract 729 from 970, we get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Going ahead to step 14:
If we divide 2410 by 243, we get 9 and a remainder of 223.
Use 9 as the next digit of our solution. 
Result so far: 89720.362139
Subtracting 2187 from 2410 leaves us with 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Step 15:
When dividing 2230 by 243, we get 9 with a remainder of 43.
Write down 9 as next digit of the result. 
Result so far: 89720.3621399
The remainder is 43 after subtracting 2187 from 2230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

The final result is 89720.3621399 with a remainder of 4.3e-07.