We divide 663435 by 31
Let's see how many times 31 fits into 663435.

Advancing to step 1:
The number 31 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 31

Step 2:
When dividing 66 by 31, we get 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 62 from 66 to get 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 31

Step 3:
43 divided by 31 is 1 with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
Deduct 31 from 43 and we're left with 12.
Bring next digit (4) of the dividend behind the 12 and repeat the process: 124 / 31

Going ahead to step 4:
124 divided by 31 is 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 214.0
Subtracting 124 from 124 leaves us with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 31

Going ahead to step 5:
If we divide 3 by 31, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 2140.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 31

Moving on to step 6:
If we divide 35 by 31, we get 1 and a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 21401.0
Subtract 31 from 35 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
40 divided by 31 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 21401.1
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.

Advancing to step 8:
90 divided by 31 is 2 with a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 21401.12
If we take 62 away from 90, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 9:
When dividing 280 by 31, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 21401.129
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.

Step 10:
If we divide 10 by 31, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 21401.129
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 11:
100 divided by 31 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 21401.12903
Subtract 93 from 100 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 12:
When dividing 70 by 31, we get 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 21401.129032
Subtracting 62 from 70 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 13:
31 goes into 80 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 21401.1290322
Subtract 62 from 80 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 21401.1290322 and a remainder of 1.8e-07.