We divide 21430487 by 51
We want to divide 21430487 by 51.

On to step 1:
If we divide 2 by 51, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 51

Let's proceed to step 2:
51 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (4) from the dividend to 21 and continue with: 214 / 51

Step 3:
If we divide 214 by 51, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 204 from 214 to get 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 51

Step 4:
103 divided by 51 is 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 42.0
Subtracting 102 from 103 leaves us with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 51

Step 5:
51 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 420.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (4) from the dividend, add it to 10, then carry on: 104 / 51

Step 6:
51 can be fit into 104 2 times, resulting in a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 4202.0
Subtracting 102 from 104 leaves us with 2.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 51

Let's proceed to step 7:
If we divide 28 by 51, we get 0 and a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 42020.0
Subtract 0 from 28 to get 28.
Include the next digit (7) from the dividend after 28, then repeat: 287 / 51

Advancing to step 8:
When dividing 287 by 51, we get 5 with a remainder of 32.
Use 5 as the next digit of our solution. 
Result so far: 420205.0
The remainder is 32 after subtracting 255 from 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 9:
320 divided by 51 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 420205.6
The remainder is 14 after subtracting 306 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 10:
The number 51 fits into 140 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 420205.62
Subtract 102 from 140 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 11:
If we divide 380 by 51, we get 7 and a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 420205.627
The remainder is 23 after subtracting 357 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 12:
If we divide 230 by 51, we get 4 and a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 420205.6274
If we take 204 away from 230, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 13:
When dividing 260 by 51, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 420205.62745
Subtract 255 from 260 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.

Advancing to step 14:
51 can be fit into 50 0 times, resulting in a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 420205.62745
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 15:
51 goes into 500 9 times with a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 420205.6274509
If we subtract 459 from 500, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 16:
51 can be fit into 410 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 420205.62745098
Deduct 408 from 410 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 420205.62745098 with a balance of 2e-09.