603210 ÷ 51 
We want to divide 603210 by 51.

Step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 51

Advancing to step 2:
If we divide 60 by 51, we get 1 and a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 51 from 60 and we're left with 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 51

Going ahead to step 3:
If we divide 93 by 51, we get 1 and a remainder of 42.
The next digit of our result is 1. 
Result so far: 11.0
The remainder is 42 after subtracting 51 from 93.
Grab the next digit (2) from the dividend, add it to 42, then carry on: 422 / 51

Going ahead to step 4:
If we divide 422 by 51, we get 8 and a remainder of 14.
The next digit of our result is 8. 
Result so far: 118.0
Deduct 408 from 422 and we're left with 14.
Bring next digit (1) of the dividend behind the 14 and repeat the process: 141 / 51

On to step 5:
51 can be fit into 141 2 times, resulting in a remainder of 39.
The number 2 becomes the next digit in our result. 
Result so far: 1182.0
Deduct 102 from 141 and we're left with 39.
Fetch the next digit (0) from the dividend, attach it to 39 and continue: 390 / 51

Advancing to step 6:
When dividing 390 by 51, we get 7 with a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 11827.0
Deduct 357 from 390 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 7:
If we divide 330 by 51, we get 6 and a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 11827.6
Subtracting 306 from 330 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 8:
51 goes into 240 4 times with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 11827.64
Subtract 204 from 240 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 9:
The number 51 fits into 360 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 11827.647
Subtract 357 from 360 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
51 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 11827.647
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 11:
51 goes into 300 5 times with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 11827.64705
If we take 255 away from 300, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 12:
If we divide 450 by 51, we get 8 and a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 11827.647058
Subtracting 408 from 450 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 13:
When dividing 420 by 51, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 11827.6470588
Subtracting 408 from 420 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 11827.6470588 and a remainder of 1.2e-07.