783057 divided by 21 
We want to figure out the number of times 783057 can be divided by 21.

Going ahead to step 1:
21 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 21

Step 2:
21 can be fit into 78 3 times, resulting in a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 15 after subtracting 63 from 78.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 21

Moving on to step 3:
21 goes into 153 7 times with a remainder of 6.
The next digit of our result is 7. 
Result so far: 37.0
Subtracting 147 from 153 leaves us with 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 21

Moving on to step 4:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 372.0
Subtract 42 from 60 to get 18.
Take the next digit (5) from the dividend and append it to 18, then repeat: 185 / 21

Moving on to step 5:
21 goes into 185 8 times with a remainder of 17.
The number 8 becomes the next digit in our result. 
Result so far: 3728.0
Deduct 168 from 185 and we're left with 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 21

On to step 6:
177 divided by 21 is 8 with a remainder of 9.
Use 8 as the next digit of our solution. 
Result so far: 37288.0
Subtract 168 from 177 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
If we divide 90 by 21, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 37288.4
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
60 divided by 21 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 37288.42
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
180 divided by 21 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 37288.428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 10:
When dividing 120 by 21, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 37288.4285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
If we divide 150 by 21, we get 7 and a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 37288.42857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 12:
When dividing 30 by 21, we get 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 37288.428571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 13:
When dividing 90 by 21, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 37288.4285714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 14:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 37288.42857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 37288.42857142 and a remainder of 1.8e-08.