We're dividing 21009423 by 487 
Let's see how many times 487 fits into 21009423.

Step 1:
When dividing 2 by 487, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 487

On to step 2:
487 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (0) from the dividend after 21, then repeat: 210 / 487

Let's proceed to step 3:
If we divide 210 by 487, we get 0 and a remainder of 210.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 210 and we're left with 210.
Append the next digit (0) from the dividend to 210 and continue with: 2100 / 487

Advancing to step 4:
487 can be fit into 2100 4 times, resulting in a remainder of 152.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 1948 from 2100 leaves us with 152.
Include the next digit (9) from the dividend after 152, then repeat: 1529 / 487

Advancing to step 5:
487 goes into 1529 3 times with a remainder of 68.
Write down 3 as next digit of the result. 
Result so far: 43.0
If we subtract 1461 from 1529, we get 68.
Fetch the next digit (4) from the dividend, attach it to 68 and continue: 684 / 487

Advancing to step 6:
If we divide 684 by 487, we get 1 and a remainder of 197.
The next digit of our result is 1. 
Result so far: 431.0
The remainder is 197 after subtracting 487 from 684.
Append the next digit (2) from the dividend to 197 and continue with: 1972 / 487

Moving on to step 7:
When dividing 1972 by 487, we get 4 with a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 4314.0
Deduct 1948 from 1972 and we're left with 24.
Bring next digit (3) of the dividend behind the 24 and repeat the process: 243 / 487

Let's proceed to step 8:
487 can be fit into 243 0 times, resulting in a remainder of 243.
Write down 0 as next digit of the result. 
Result so far: 43140.0
If we take 0 away from 243, we end up with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Advancing to step 9:
When dividing 2430 by 487, we get 4 with a remainder of 482.
Record the quotient 4 as the next digit in the result. 
Result so far: 43140.4
The remainder is 482 after subtracting 1948 from 2430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4820, and continue the process.

Advancing to step 10:
The number 487 fits into 4820 9 times, leaving a remainder of 437.
Put 9 as the next digit of the answer. 
Result so far: 43140.49
If we subtract 4383 from 4820, we get 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Advancing to step 11:
487 can be fit into 4370 8 times, resulting in a remainder of 474.
The next digit of our result is 8. 
Result so far: 43140.498
Subtract 3896 from 4370 to get 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Moving on to step 12:
487 can be fit into 4740 9 times, resulting in a remainder of 357.
Write down 9 as next digit of the result. 
Result so far: 43140.4989
If we subtract 4383 from 4740, we get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Advancing to step 13:
If we divide 3570 by 487, we get 7 and a remainder of 161.
Record the quotient 7 as the next digit in the result. 
Result so far: 43140.49897
If we subtract 3409 from 3570, we get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

On to step 14:
487 can be fit into 1610 3 times, resulting in a remainder of 149.
The number 3 becomes the next digit in our result. 
Result so far: 43140.498973
Subtract 1461 from 1610 to get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Moving on to step 15:
487 can be fit into 1490 3 times, resulting in a remainder of 29.
The number 3 becomes the next digit in our result. 
Result so far: 43140.4989733
Subtract 1461 from 1490 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 43140.4989733 with a remaining 2.9e-07.