We're dividing 21803093 by 78 
We want to figure out the number of times 21803093 can be divided by 78.

Step 1:
When dividing 2 by 78, we get 0 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.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 78

Advancing to step 2:
When dividing 21 by 78, we get 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (8) from the dividend, add it to 21, then carry on: 218 / 78

On to step 3:
The number 78 fits into 218 2 times, leaving a remainder of 62.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 156 from 218 leaves us with 62.
Grab the next digit (0) from the dividend, add it to 62, then carry on: 620 / 78

On to step 4:
620 divided by 78 is 7 with a remainder of 74.
The next digit of our result is 7. 
Result so far: 27.0
Subtract 546 from 620 to get 74.
Append the next digit (3) from the dividend to 74 and continue with: 743 / 78

Advancing to step 5:
When dividing 743 by 78, we get 9 with a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 279.0
Subtracting 702 from 743 leaves us with 41.
Bring next digit (0) of the dividend behind the 41 and repeat the process: 410 / 78

Moving on to step 6:
If we divide 410 by 78, we get 5 and a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 2795.0
Deduct 390 from 410 and we're left with 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 78

Moving on to step 7:
The number 78 fits into 209 2 times, leaving a remainder of 53.
Write down 2 as next digit of the result. 
Result so far: 27952.0
Deduct 156 from 209 and we're left with 53.
Bring next digit (3) of the dividend behind the 53 and repeat the process: 533 / 78

Going ahead to step 8:
The number 78 fits into 533 6 times, leaving a remainder of 65.
Write down 6 as next digit of the result. 
Result so far: 279526.0
If we subtract 468 from 533, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 9:
The number 78 fits into 650 8 times, leaving a remainder of 26.
Use 8 as the next digit of our solution. 
Result so far: 279526.8
Subtracting 624 from 650 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 10:
78 goes into 260 3 times with a remainder of 26.
Put 3 as the next digit of the answer. 
Result so far: 279526.83
Deduct 234 from 260 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 11:
When dividing 260 by 78, we get 3 with a remainder of 26.
Write down 3 as next digit of the result. 
Result so far: 279526.833
The remainder is 26 after subtracting 234 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The quotient of the division is 279526.833, and the remainder is 0.0026.