We're dividing 663639 by 53 
We want to divide 663639 by 53.

Step 1:
If we divide 6 by 53, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 53

Let's proceed to step 2:
The number 53 fits into 66 1 times, leaving a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 53 from 66 and we're left with 13.
Fetch the next digit (3) from the dividend, attach it to 13 and continue: 133 / 53

Moving on to step 3:
The number 53 fits into 133 2 times, leaving a remainder of 27.
The next digit of our result is 2. 
Result so far: 12.0
Subtract 106 from 133 to get 27.
Append the next digit (6) from the dividend to 27 and continue with: 276 / 53

Step 4:
If we divide 276 by 53, we get 5 and a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 125.0
The remainder is 11 after subtracting 265 from 276.
Fetch the next digit (3) from the dividend, attach it to 11 and continue: 113 / 53

Going ahead to step 5:
113 divided by 53 is 2 with a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 1252.0
Subtracting 106 from 113 leaves us with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 53

Step 6:
79 divided by 53 is 1 with a remainder of 26.
The number 1 becomes the next digit in our result. 
Result so far: 12521.0
If we subtract 53 from 79, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 7:
The number 53 fits into 260 4 times, leaving a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 12521.4
If we take 212 away from 260, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 8:
53 goes into 480 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 12521.49
Subtract 477 from 480 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
53 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 12521.49
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 10:
300 divided by 53 is 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 12521.4905
Subtract 265 from 300 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 11:
When dividing 350 by 53, we get 6 with a remainder of 32.
Use 6 as the next digit of our solution. 
Result so far: 12521.49056
Deduct 318 from 350 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 12:
53 can be fit into 320 6 times, resulting in a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 12521.490566
The remainder is 2 after subtracting 318 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 12521.490566, with a leftover of 2e-07.