645444 divided by 53 
We're looking to find how many times 53 goes into 645444.

Step 1:
When dividing 6 by 53, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 53

Let's proceed to step 2:
53 goes into 64 1 times with a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 11 after subtracting 53 from 64.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 53

Going ahead to step 3:
If we divide 115 by 53, we get 2 and a remainder of 9.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 106 from 115, we get 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 53

Advancing to step 4:
94 divided by 53 is 1 with a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 121.0
Subtracting 53 from 94 leaves us with 41.
Grab the next digit (4) from the dividend, add it to 41, then carry on: 414 / 53

Let's proceed to step 5:
53 can be fit into 414 7 times, resulting in a remainder of 43.
Write down 7 as next digit of the result. 
Result so far: 1217.0
The remainder is 43 after subtracting 371 from 414.
Fetch the next digit (4) from the dividend, attach it to 43 and continue: 434 / 53

Advancing to step 6:
53 goes into 434 8 times with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 12178.0
If we take 424 away from 434, we end up 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.

Moving on to step 7:
If we divide 100 by 53, we get 1 and a remainder of 47.
Write down 1 as next digit of the result. 
Result so far: 12178.1
Deduct 53 from 100 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 8:
If we divide 470 by 53, we get 8 and a remainder of 46.
Write down 8 as next digit of the result. 
Result so far: 12178.18
Subtracting 424 from 470 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 9:
460 divided by 53 is 8 with a remainder of 36.
Write down 8 as next digit of the result. 
Result so far: 12178.188
If we take 424 away from 460, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final outcome is 12178.188, with a leftover of 0.0036.