We're dividing 53404319 by 391 
We want to divide 53404319 by 391.

On to step 1:
391 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 391

Let's proceed to step 2:
53 divided by 391 is 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Fetch the next digit (4) from the dividend, attach it to 53 and continue: 534 / 391

Step 3:
534 divided by 391 is 1 with a remainder of 143.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 391 from 534, we get 143.
Grab the next digit (0) from the dividend, add it to 143, then carry on: 1430 / 391

On to step 4:
The number 391 fits into 1430 3 times, leaving a remainder of 257.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1173 from 1430, we get 257.
Fetch the next digit (4) from the dividend, attach it to 257 and continue: 2574 / 391

Step 5:
391 can be fit into 2574 6 times, resulting in a remainder of 228.
Record the quotient 6 as the next digit in the result. 
Result so far: 136.0
Deduct 2346 from 2574 and we're left with 228.
Take the next digit (3) from the dividend and append it to 228, then repeat: 2283 / 391

Advancing to step 6:
391 goes into 2283 5 times with a remainder of 328.
The next digit of our result is 5. 
Result so far: 1365.0
Subtract 1955 from 2283 to get 328.
Take the next digit (1) from the dividend and append it to 328, then repeat: 3281 / 391

Advancing to step 7:
The number 391 fits into 3281 8 times, leaving a remainder of 153.
The next digit of our result is 8. 
Result so far: 13658.0
Subtracting 3128 from 3281 leaves us with 153.
Grab the next digit (9) from the dividend, add it to 153, then carry on: 1539 / 391

Step 8:
When dividing 1539 by 391, we get 3 with a remainder of 366.
The number 3 becomes the next digit in our result. 
Result so far: 136583.0
The remainder is 366 after subtracting 1173 from 1539.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Moving on to step 9:
When dividing 3660 by 391, we get 9 with a remainder of 141.
The number 9 becomes the next digit in our result. 
Result so far: 136583.9
Subtracting 3519 from 3660 leaves us with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Step 10:
1410 divided by 391 is 3 with a remainder of 237.
Write down 3 as next digit of the result. 
Result so far: 136583.93
The remainder is 237 after subtracting 1173 from 1410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

Step 11:
When dividing 2370 by 391, we get 6 with a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 136583.936
Subtracting 2346 from 2370 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.

Step 12:
If we divide 240 by 391, we get 0 and a remainder of 240.
The number 0 becomes the next digit in our result. 
Result so far: 136583.936
If we subtract 0 from 240, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 13:
If we divide 2400 by 391, we get 6 and a remainder of 54.
The next digit of our result is 6. 
Result so far: 136583.93606
The remainder is 54 after subtracting 2346 from 2400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 14:
391 goes into 540 1 times with a remainder of 149.
Write down 1 as next digit of the result. 
Result so far: 136583.936061
Deduct 391 from 540 and we're left with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Going ahead to step 15:
The number 391 fits into 1490 3 times, leaving a remainder of 317.
Use 3 as the next digit of our solution. 
Result so far: 136583.9360613
Deduct 1173 from 1490 and we're left with 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Let's proceed to step 16:
The number 391 fits into 3170 8 times, leaving a remainder of 42.
The next digit of our result is 8. 
Result so far: 136583.93606138
Subtracting 3128 from 3170 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.

The quotient of the division is 136583.93606138, and the remainder is 4.2e-08.