We're dividing 64863870 by 243 
We want to figure out the number of times 64863870 can be divided by 243.

Step 1:
When dividing 6 by 243, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 243

Step 2:
The number 243 fits into 64 0 times, leaving a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Grab the next digit (8) from the dividend, add it to 64, then carry on: 648 / 243

Moving on to step 3:
243 goes into 648 2 times with a remainder of 162.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 486 from 648 to get 162.
Bring next digit (6) of the dividend behind the 162 and repeat the process: 1626 / 243

Going ahead to step 4:
When dividing 1626 by 243, we get 6 with a remainder of 168.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
Deduct 1458 from 1626 and we're left with 168.
Include the next digit (3) from the dividend after 168, then repeat: 1683 / 243

On to step 5:
The number 243 fits into 1683 6 times, leaving a remainder of 225.
Use 6 as the next digit of our solution. 
Result so far: 266.0
The remainder is 225 after subtracting 1458 from 1683.
Fetch the next digit (8) from the dividend, attach it to 225 and continue: 2258 / 243

Moving on to step 6:
If we divide 2258 by 243, we get 9 and a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 2669.0
The remainder is 71 after subtracting 2187 from 2258.
Bring next digit (7) of the dividend behind the 71 and repeat the process: 717 / 243

On to step 7:
If we divide 717 by 243, we get 2 and a remainder of 231.
Use 2 as the next digit of our solution. 
Result so far: 26692.0
Subtracting 486 from 717 leaves us with 231.
Grab the next digit (0) from the dividend, add it to 231, then carry on: 2310 / 243

On to step 8:
When dividing 2310 by 243, we get 9 with a remainder of 123.
Use 9 as the next digit of our solution. 
Result so far: 266929.0
Deduct 2187 from 2310 and we're left with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Advancing to step 9:
If we divide 1230 by 243, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 266929.5
The remainder is 15 after subtracting 1215 from 1230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
When dividing 150 by 243, we get 0 with a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 266929.5
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Moving on to step 11:
243 goes into 1500 6 times with a remainder of 42.
Put 6 as the next digit of the answer. 
Result so far: 266929.506
Deduct 1458 from 1500 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 12:
243 goes into 420 1 times with a remainder of 177.
The number 1 becomes the next digit in our result. 
Result so far: 266929.5061
If we subtract 243 from 420, we get 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Going ahead to step 13:
243 goes into 1770 7 times with a remainder of 69.
Write down 7 as next digit of the result. 
Result so far: 266929.50617
Subtracting 1701 from 1770 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 14:
243 goes into 690 2 times with a remainder of 204.
Put 2 as the next digit of the answer. 
Result so far: 266929.506172
Subtracting 486 from 690 leaves us with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Let's proceed to step 15:
The number 243 fits into 2040 8 times, leaving a remainder of 96.
Use 8 as the next digit of our solution. 
Result so far: 266929.5061728
If we subtract 1944 from 2040, we get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Let's proceed to step 16:
243 goes into 960 3 times with a remainder of 231.
The number 3 becomes the next digit in our result. 
Result so far: 266929.50617283
Subtract 729 from 960 to get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

After the division, we end up with 266929.50617283 and a remainder of 2.31e-07.