We divide 40748402 by 21
Let's see how many times 21 fits into 40748402.

On to step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 21

Advancing to step 2:
21 goes into 40 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 21 from 40 to get 19.
Take the next digit (7) from the dividend and append it to 19, then repeat: 197 / 21

Going ahead to step 3:
21 goes into 197 9 times with a remainder of 8.
The next digit of our result is 9. 
Result so far: 19.0
If we take 189 away from 197, we end up with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 21

Going ahead to step 4:
The number 21 fits into 84 4 times, leaving a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 194.0
The remainder is 0 after subtracting 84 from 84.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 21

On to step 5:
21 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 1940.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 21

On to step 6:
If we divide 84 by 21, we get 4 and a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 19404.0
The remainder is 0 after subtracting 84 from 84.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 21

Advancing to step 7:
If we divide 0 by 21, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 194040.0
Subtract 0 from 0 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 21

On to step 8:
If we divide 2 by 21, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 1940400.0
If we subtract 0 from 2, 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.

Advancing to step 9:
When dividing 20 by 21, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 1940400.0
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.

On to step 10:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 1940400.09
If we take 189 away from 200, we end up 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.

Step 11:
If we divide 110 by 21, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 1940400.095
Subtract 105 from 110 to 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 12:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 1940400.0952
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.

Let's proceed to step 13:
If we divide 80 by 21, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 1940400.09523
If we subtract 63 from 80, we 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.

Advancing to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1940400.095238
Subtract 168 from 170 to 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.

Moving on to step 15:
21 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 1940400.095238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 16:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 1940400.09523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final outcome is 1940400.09523809, with a leftover of 1.1e-08.