418930 ÷ 21 
We want to figure out the number of times 418930 can be divided by 21.

Step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Let's proceed to step 2:
21 goes into 41 1 times with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 21 from 41, we get 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 21

Step 3:
208 divided by 21 is 9 with a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we subtract 189 from 208, we get 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 21

On to step 4:
21 can be fit into 199 9 times, resulting in a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 199.0
The remainder is 10 after subtracting 189 from 199.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 21

Let's proceed to step 5:
21 can be fit into 103 4 times, resulting in a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 1994.0
The remainder is 19 after subtracting 84 from 103.
Fetch the next digit (0) from the dividend, attach it to 19 and continue: 190 / 21

Advancing to step 6:
21 goes into 190 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 19949.0
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
The number 21 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 19949.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
100 divided by 21 is 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 19949.04
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 9:
160 divided by 21 is 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 19949.047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 10:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 19949.0476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
40 divided by 21 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 19949.04761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 12:
If we divide 190 by 21, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 19949.047619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 13:
10 divided by 21 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 19949.047619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
If we divide 100 by 21, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 19949.04761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 19949.04761904 and a remainder of 1.6e-08.