513551 ÷ 31 
We want to figure out the number of times 513551 can be divided by 31.

On to step 1:
The number 31 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 31

On to step 2:
51 divided by 31 is 1 with a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 31 from 51 to get 20.
Fetch the next digit (3) from the dividend, attach it to 20 and continue: 203 / 31

On to step 3:
31 can be fit into 203 6 times, resulting in a remainder of 17.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 186 from 203, we get 17.
Take the next digit (5) from the dividend and append it to 17, then repeat: 175 / 31

Advancing to step 4:
If we divide 175 by 31, we get 5 and a remainder of 20.
The next digit of our result is 5. 
Result so far: 165.0
Subtract 155 from 175 to get 20.
Include the next digit (5) from the dividend after 20, then repeat: 205 / 31

Let's proceed to step 5:
205 divided by 31 is 6 with a remainder of 19.
The next digit of our result is 6. 
Result so far: 1656.0
The remainder is 19 after subtracting 186 from 205.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 31

Advancing to step 6:
191 divided by 31 is 6 with a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 16566.0
Subtract 186 from 191 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
31 goes into 50 1 times with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 16566.1
If we subtract 31 from 50, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 8:
31 goes into 190 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 16566.16
If we take 186 away from 190, we end up 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.

Going ahead to step 9:
If we divide 40 by 31, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 16566.161
Subtracting 31 from 40 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 10:
31 can be fit into 90 2 times, resulting in a remainder of 28.
The next digit of our result is 2. 
Result so far: 16566.1612
If we subtract 62 from 90, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 11:
31 goes into 280 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 16566.16129
Deduct 279 from 280 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 12:
If we divide 10 by 31, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 16566.16129
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 13:
31 can be fit into 100 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 16566.1612903
Deduct 93 from 100 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 14:
If we divide 70 by 31, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 16566.16129032
Subtract 62 from 70 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 16566.16129032, with a leftover of 8e-09.