We look at the division of 51516807 by 257 
Let's see how many times 257 fits into 51516807.

Step 1:
257 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 257

Let's proceed to step 2:
257 goes into 51 0 times with a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Take the next digit (5) from the dividend and append it to 51, then repeat: 515 / 257

Let's proceed to step 3:
515 divided by 257 is 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 514 away from 515, we end up with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 257

Going ahead to step 4:
The number 257 fits into 11 0 times, leaving a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (6) from the dividend, attach it to 11 and continue: 116 / 257

On to step 5:
If we divide 116 by 257, we get 0 and a remainder of 116.
Record the quotient 0 as the next digit in the result. 
Result so far: 200.0
If we subtract 0 from 116, we get 116.
Fetch the next digit (8) from the dividend, attach it to 116 and continue: 1168 / 257

On to step 6:
When dividing 1168 by 257, we get 4 with a remainder of 140.
Write down 4 as next digit of the result. 
Result so far: 2004.0
Subtracting 1028 from 1168 leaves us with 140.
Append the next digit (0) from the dividend to 140 and continue with: 1400 / 257

Advancing to step 7:
1400 divided by 257 is 5 with a remainder of 115.
Put 5 as the next digit of the answer. 
Result so far: 20045.0
Deduct 1285 from 1400 and we're left with 115.
Bring next digit (7) of the dividend behind the 115 and repeat the process: 1157 / 257

Moving on to step 8:
257 can be fit into 1157 4 times, resulting in a remainder of 129.
Record the quotient 4 as the next digit in the result. 
Result so far: 200454.0
If we take 1028 away from 1157, we end up with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Advancing to step 9:
The number 257 fits into 1290 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 200454.5
Deduct 1285 from 1290 and we're left 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 10:
The number 257 fits into 50 0 times, leaving a remainder of 50.
The next digit of our result is 0. 
Result so far: 200454.5
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.

Let's proceed to step 11:
257 goes into 500 1 times with a remainder of 243.
The next digit of our result is 1. 
Result so far: 200454.501
Deduct 257 from 500 and we're left 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.

Step 12:
When dividing 2430 by 257, we get 9 with a remainder of 117.
Use 9 as the next digit of our solution. 
Result so far: 200454.5019
If we take 2313 away from 2430, we end up with 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Step 13:
When dividing 1170 by 257, we get 4 with a remainder of 142.
The next digit of our result is 4. 
Result so far: 200454.50194
If we subtract 1028 from 1170, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 14:
If we divide 1420 by 257, we get 5 and a remainder of 135.
Record the quotient 5 as the next digit in the result. 
Result so far: 200454.501945
Subtracting 1285 from 1420 leaves us with 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Let's proceed to step 15:
257 goes into 1350 5 times with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 200454.5019455
Subtract 1285 from 1350 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The quotient of the division is 200454.5019455, and the remainder is 6.5e-07.