Let's divide 787149 by 21
We want to divide 787149 by 21.

Step 1:
21 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 21

Moving on to step 2:
78 divided by 21 is 3 with 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.
Fetch the next digit (7) from the dividend, attach it to 15 and continue: 157 / 21

Advancing to step 3:
21 goes into 157 7 times with a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 37.0
If we take 147 away from 157, we end up with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 21

Moving on to step 4:
The number 21 fits into 101 4 times, leaving a remainder of 17.
The next digit of our result is 4. 
Result so far: 374.0
Subtracting 84 from 101 leaves us with 17.
Bring next digit (4) of the dividend behind the 17 and repeat the process: 174 / 21

Step 5:
21 goes into 174 8 times with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 3748.0
If we take 168 away from 174, we end up with 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 21

Moving on to step 6:
21 can be fit into 69 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 37483.0
If we take 63 away from 69, 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 7:
When dividing 60 by 21, we get 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 37483.2
If we subtract 42 from 60, we 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.

Moving on to step 8:
21 goes into 180 8 times with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 37483.28
Deduct 168 from 180 and we're left 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.

On to step 9:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 37483.285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 10:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 37483.2857
If we take 147 away from 150, we end up 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.

Step 11:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 37483.28571
If we subtract 21 from 30, we 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.

Let's proceed to step 12:
21 goes into 90 4 times with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 37483.285714
Subtracting 84 from 90 leaves us 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.

On to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 37483.2857142
Deduct 42 from 60 and we're left 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.

Step 14:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The next digit of our result is 8. 
Result so far: 37483.28571428
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.

Our division results in 37483.28571428 with a remaining 1.2e-08.