We divide 623518 by 21
Let's see how many times 21 fits into 623518.

Let's proceed to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 21

Let's proceed to step 2:
21 goes into 62 2 times with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 42 from 62 leaves us with 20.
Include the next digit (3) from the dividend after 20, then repeat: 203 / 21

Step 3:
If we divide 203 by 21, we get 9 and a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtracting 189 from 203 leaves us with 14.
Fetch the next digit (5) from the dividend, attach it to 14 and continue: 145 / 21

Step 4:
21 can be fit into 145 6 times, resulting in a remainder of 19.
Record the quotient 6 as the next digit in the result. 
Result so far: 296.0
Subtract 126 from 145 to get 19.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 21

On to step 5:
The number 21 fits into 191 9 times, leaving a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 2969.0
Deduct 189 from 191 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 21

Advancing to step 6:
If we divide 28 by 21, we get 1 and a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 29691.0
If we take 21 away from 28, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 7:
70 divided by 21 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 29691.3
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
21 goes into 70 3 times with a remainder of 7.
The next digit of our result is 3. 
Result so far: 29691.33
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 29691.33 with a remainder of 0.007.