Let's divide 51591299 by 407
Let's see how many times 407 fits into 51591299.

Advancing to step 1:
407 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 407

Going ahead to step 2:
407 goes into 51 0 times with a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Append the next digit (5) from the dividend to 51 and continue with: 515 / 407

Going ahead to step 3:
If we divide 515 by 407, we get 1 and a remainder of 108.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 407 from 515 leaves us with 108.
Take the next digit (9) from the dividend and append it to 108, then repeat: 1089 / 407

Let's proceed to step 4:
If we divide 1089 by 407, we get 2 and a remainder of 275.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 814 from 1089 leaves us with 275.
Grab the next digit (1) from the dividend, add it to 275, then carry on: 2751 / 407

Step 5:
The number 407 fits into 2751 6 times, leaving a remainder of 309.
The next digit of our result is 6. 
Result so far: 126.0
The remainder is 309 after subtracting 2442 from 2751.
Grab the next digit (2) from the dividend, add it to 309, then carry on: 3092 / 407

Advancing to step 6:
407 goes into 3092 7 times with a remainder of 243.
Write down 7 as next digit of the result. 
Result so far: 1267.0
Subtracting 2849 from 3092 leaves us with 243.
Fetch the next digit (9) from the dividend, attach it to 243 and continue: 2439 / 407

Advancing to step 7:
When dividing 2439 by 407, we get 5 with a remainder of 404.
Put 5 as the next digit of the answer. 
Result so far: 12675.0
The remainder is 404 after subtracting 2035 from 2439.
Include the next digit (9) from the dividend after 404, then repeat: 4049 / 407

Advancing to step 8:
When dividing 4049 by 407, we get 9 with a remainder of 386.
Write down 9 as next digit of the result. 
Result so far: 126759.0
The remainder is 386 after subtracting 3663 from 4049.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Step 9:
If we divide 3860 by 407, we get 9 and a remainder of 197.
Use 9 as the next digit of our solution. 
Result so far: 126759.9
Subtract 3663 from 3860 to get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Moving on to step 10:
If we divide 1970 by 407, we get 4 and a remainder of 342.
Record the quotient 4 as the next digit in the result. 
Result so far: 126759.94
The remainder is 342 after subtracting 1628 from 1970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Advancing to step 11:
The number 407 fits into 3420 8 times, leaving a remainder of 164.
Use 8 as the next digit of our solution. 
Result so far: 126759.948
The remainder is 164 after subtracting 3256 from 3420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Going ahead to step 12:
When dividing 1640 by 407, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 126759.9484
Subtracting 1628 from 1640 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.

Moving on to step 13:
When dividing 120 by 407, we get 0 with a remainder of 120.
Write down 0 as next digit of the result. 
Result so far: 126759.9484
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 14:
When dividing 1200 by 407, we get 2 with a remainder of 386.
Put 2 as the next digit of the answer. 
Result so far: 126759.948402
If we take 814 away from 1200, we end up with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Let's proceed to step 15:
407 can be fit into 3860 9 times, resulting in a remainder of 197.
Use 9 as the next digit of our solution. 
Result so far: 126759.9484029
Subtracting 3663 from 3860 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Advancing to step 16:
If we divide 1970 by 407, we get 4 and a remainder of 342.
Record the quotient 4 as the next digit in the result. 
Result so far: 126759.94840294
If we take 1628 away from 1970, we end up with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

The final outcome is 126759.94840294, with a leftover of 3.42e-07.