51391321 ÷ 854 
Our goal is to divide 51391321 by 854.

Step 1:
The number 854 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 854

Moving on to step 2:
854 goes into 51 0 times with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Append the next digit (3) from the dividend to 51 and continue with: 513 / 854

Going ahead to step 3:
854 goes into 513 0 times with a remainder of 513.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 513 and we're left with 513.
Append the next digit (9) from the dividend to 513 and continue with: 5139 / 854

Moving on to step 4:
When dividing 5139 by 854, we get 6 with a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 5124 from 5139, we get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 854

Advancing to step 5:
854 goes into 151 0 times with a remainder of 151.
Use 0 as the next digit of our solution. 
Result so far: 60.0
Subtracting 0 from 151 leaves us with 151.
Append the next digit (3) from the dividend to 151 and continue with: 1513 / 854

Advancing to step 6:
When dividing 1513 by 854, we get 1 with a remainder of 659.
Use 1 as the next digit of our solution. 
Result so far: 601.0
Subtracting 854 from 1513 leaves us with 659.
Grab the next digit (2) from the dividend, add it to 659, then carry on: 6592 / 854

Going ahead to step 7:
854 can be fit into 6592 7 times, resulting in a remainder of 614.
Write down 7 as next digit of the result. 
Result so far: 6017.0
If we take 5978 away from 6592, we end up with 614.
Include the next digit (1) from the dividend after 614, then repeat: 6141 / 854

Let's proceed to step 8:
854 goes into 6141 7 times with a remainder of 163.
The number 7 becomes the next digit in our result. 
Result so far: 60177.0
The remainder is 163 after subtracting 5978 from 6141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Let's proceed to step 9:
The number 854 fits into 1630 1 times, leaving a remainder of 776.
The next digit of our result is 1. 
Result so far: 60177.1
Deduct 854 from 1630 and we're left with 776.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7760, and continue the process.

Moving on to step 10:
The number 854 fits into 7760 9 times, leaving a remainder of 74.
Write down 9 as next digit of the result. 
Result so far: 60177.19
Deduct 7686 from 7760 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 11:
854 can be fit into 740 0 times, resulting in a remainder of 740.
Use 0 as the next digit of our solution. 
Result so far: 60177.19
Subtract 0 from 740 to get 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7400, and continue the process.

Going ahead to step 12:
The number 854 fits into 7400 8 times, leaving a remainder of 568.
Record the quotient 8 as the next digit in the result. 
Result so far: 60177.1908
The remainder is 568 after subtracting 6832 from 7400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Going ahead to step 13:
If we divide 5680 by 854, we get 6 and a remainder of 556.
Record the quotient 6 as the next digit in the result. 
Result so far: 60177.19086
Subtract 5124 from 5680 to get 556.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

Moving on to step 14:
854 can be fit into 5560 6 times, resulting in a remainder of 436.
Put 6 as the next digit of the answer. 
Result so far: 60177.190866
If we subtract 5124 from 5560, we get 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

The final outcome is 60177.190866, with a leftover of 4.36e-05.