51402607 ÷ 309 
Our goal is to divide 51402607 by 309.

Moving on to step 1:
5 divided by 309 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 309

Moving on to step 2:
309 can be fit into 51 0 times, resulting in a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Grab the next digit (4) from the dividend, add it to 51, then carry on: 514 / 309

On to step 3:
514 divided by 309 is 1 with a remainder of 205.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 309 from 514 and we're left with 205.
Take the next digit (0) from the dividend and append it to 205, then repeat: 2050 / 309

Going ahead to step 4:
2050 divided by 309 is 6 with a remainder of 196.
The next digit of our result is 6. 
Result so far: 16.0
If we subtract 1854 from 2050, we get 196.
Bring next digit (2) of the dividend behind the 196 and repeat the process: 1962 / 309

Step 5:
309 can be fit into 1962 6 times, resulting in a remainder of 108.
Record the quotient 6 as the next digit in the result. 
Result so far: 166.0
If we subtract 1854 from 1962, we get 108.
Append the next digit (6) from the dividend to 108 and continue with: 1086 / 309

Step 6:
If we divide 1086 by 309, we get 3 and a remainder of 159.
Put 3 as the next digit of the answer. 
Result so far: 1663.0
The remainder is 159 after subtracting 927 from 1086.
Fetch the next digit (0) from the dividend, attach it to 159 and continue: 1590 / 309

Going ahead to step 7:
309 can be fit into 1590 5 times, resulting in a remainder of 45.
The next digit of our result is 5. 
Result so far: 16635.0
If we subtract 1545 from 1590, we get 45.
Take the next digit (7) from the dividend and append it to 45, then repeat: 457 / 309

Let's proceed to step 8:
If we divide 457 by 309, we get 1 and a remainder of 148.
Put 1 as the next digit of the answer. 
Result so far: 166351.0
Subtracting 309 from 457 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Advancing to step 9:
When dividing 1480 by 309, we get 4 with a remainder of 244.
Record the quotient 4 as the next digit in the result. 
Result so far: 166351.4
Subtracting 1236 from 1480 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 10:
309 can be fit into 2440 7 times, resulting in a remainder of 277.
The number 7 becomes the next digit in our result. 
Result so far: 166351.47
If we take 2163 away from 2440, we end up with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Advancing to step 11:
309 can be fit into 2770 8 times, resulting in a remainder of 298.
Put 8 as the next digit of the answer. 
Result so far: 166351.478
If we subtract 2472 from 2770, we get 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Going ahead to step 12:
2980 divided by 309 is 9 with a remainder of 199.
Write down 9 as next digit of the result. 
Result so far: 166351.4789
Deduct 2781 from 2980 and we're left with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Advancing to step 13:
309 can be fit into 1990 6 times, resulting in a remainder of 136.
Write down 6 as next digit of the result. 
Result so far: 166351.47896
Subtracting 1854 from 1990 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Step 14:
If we divide 1360 by 309, we get 4 and a remainder of 124.
Write down 4 as next digit of the result. 
Result so far: 166351.478964
Subtracting 1236 from 1360 leaves us with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 15:
The number 309 fits into 1240 4 times, leaving a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 166351.4789644
Subtracting 1236 from 1240 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 166351.4789644, with a leftover of 4e-08.