445058 ÷ 21 
Our goal is to divide 445058 by 21.

Step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 21

Advancing to step 2:
21 goes into 44 2 times with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 42 from 44, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 21

Moving on to step 3:
21 can be fit into 25 1 times, resulting in a remainder of 4.
The next digit of our result is 1. 
Result so far: 21.0
Subtract 21 from 25 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 21

Moving on to step 4:
If we divide 40 by 21, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 211.0
If we subtract 21 from 40, we get 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 21

Step 5:
The number 21 fits into 195 9 times, leaving a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 2119.0
Subtract 189 from 195 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 21

On to step 6:
If we divide 68 by 21, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 21193.0
If we take 63 away from 68, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 21193.2
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 21193.23
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 9:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 21193.238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 21193.238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 21193.23809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 12:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 21193.238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 13:
50 divided by 21 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 21193.2380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 14:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 21193.23809523
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The quotient of the division is 21193.23809523, and the remainder is 1.7e-08.