15400142 divided by 257 
Our goal is to divide 15400142 by 257.

Let's proceed to step 1:
When dividing 1 by 257, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 257

Step 2:
If we divide 15 by 257, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 257

Moving on to step 3:
154 divided by 257 is 0 with a remainder of 154.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 154 leaves us with 154.
Include the next digit (0) from the dividend after 154, then repeat: 1540 / 257

Advancing to step 4:
When dividing 1540 by 257, we get 5 with a remainder of 255.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 1285 from 1540 to get 255.
Bring next digit (0) of the dividend behind the 255 and repeat the process: 2550 / 257

Let's proceed to step 5:
257 goes into 2550 9 times with a remainder of 237.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
Subtracting 2313 from 2550 leaves us with 237.
Fetch the next digit (1) from the dividend, attach it to 237 and continue: 2371 / 257

Going ahead to step 6:
257 goes into 2371 9 times with a remainder of 58.
The next digit of our result is 9. 
Result so far: 599.0
Subtract 2313 from 2371 to get 58.
Include the next digit (4) from the dividend after 58, then repeat: 584 / 257

On to step 7:
The number 257 fits into 584 2 times, leaving a remainder of 70.
Put 2 as the next digit of the answer. 
Result so far: 5992.0
Deduct 514 from 584 and we're left with 70.
Fetch the next digit (2) from the dividend, attach it to 70 and continue: 702 / 257

Moving on to step 8:
If we divide 702 by 257, we get 2 and a remainder of 188.
The number 2 becomes the next digit in our result. 
Result so far: 59922.0
If we take 514 away from 702, we end up with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 9:
257 can be fit into 1880 7 times, resulting in a remainder of 81.
The number 7 becomes the next digit in our result. 
Result so far: 59922.7
Subtracting 1799 from 1880 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 10:
810 divided by 257 is 3 with a remainder of 39.
Put 3 as the next digit of the answer. 
Result so far: 59922.73
Subtracting 771 from 810 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 11:
If we divide 390 by 257, we get 1 and a remainder of 133.
Write down 1 as next digit of the result. 
Result so far: 59922.731
Subtract 257 from 390 to get 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

Moving on to step 12:
1330 divided by 257 is 5 with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 59922.7315
If we take 1285 away from 1330, 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.

Let's proceed to step 13:
The number 257 fits into 450 1 times, leaving a remainder of 193.
Record the quotient 1 as the next digit in the result. 
Result so far: 59922.73151
If we subtract 257 from 450, we get 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Advancing to step 14:
257 goes into 1930 7 times with a remainder of 131.
Write down 7 as next digit of the result. 
Result so far: 59922.731517
Deduct 1799 from 1930 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

On to step 15:
257 can be fit into 1310 5 times, resulting in a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 59922.7315175
Subtract 1285 from 1310 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 16:
When dividing 250 by 257, we get 0 with a remainder of 250.
The number 0 becomes the next digit in our result. 
Result so far: 59922.7315175
The remainder is 250 after subtracting 0 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

The final outcome is 59922.7315175, with a leftover of 2.5e-07.