We're dividing 57475338 by 645 
We want to figure out the number of times 57475338 can be divided by 645.

Step 1:
645 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 645

Advancing to step 2:
When dividing 57 by 645, we get 0 with a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 57, we end up with 57.
Take the next digit (4) from the dividend and append it to 57, then repeat: 574 / 645

Going ahead to step 3:
645 goes into 574 0 times with a remainder of 574.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 574 leaves us with 574.
Append the next digit (7) from the dividend to 574 and continue with: 5747 / 645

On to step 4:
645 can be fit into 5747 8 times, resulting in a remainder of 587.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 587 after subtracting 5160 from 5747.
Grab the next digit (5) from the dividend, add it to 587, then carry on: 5875 / 645

On to step 5:
645 goes into 5875 9 times with a remainder of 70.
Put 9 as the next digit of the answer. 
Result so far: 89.0
Subtracting 5805 from 5875 leaves us with 70.
Fetch the next digit (3) from the dividend, attach it to 70 and continue: 703 / 645

Advancing to step 6:
When dividing 703 by 645, we get 1 with a remainder of 58.
Use 1 as the next digit of our solution. 
Result so far: 891.0
The remainder is 58 after subtracting 645 from 703.
Grab the next digit (3) from the dividend, add it to 58, then carry on: 583 / 645

On to step 7:
645 goes into 583 0 times with a remainder of 583.
The number 0 becomes the next digit in our result. 
Result so far: 8910.0
If we take 0 away from 583, we end up with 583.
Bring next digit (8) of the dividend behind the 583 and repeat the process: 5838 / 645

Going ahead to step 8:
The number 645 fits into 5838 9 times, leaving a remainder of 33.
The number 9 becomes the next digit in our result. 
Result so far: 89109.0
If we take 5805 away from 5838, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 9:
When dividing 330 by 645, we get 0 with a remainder of 330.
Use 0 as the next digit of our solution. 
Result so far: 89109.0
Subtract 0 from 330 to get 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 10:
When dividing 3300 by 645, we get 5 with a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 89109.05
If we take 3225 away from 3300, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 11:
When dividing 750 by 645, we get 1 with a remainder of 105.
Put 1 as the next digit of the answer. 
Result so far: 89109.051
Subtracting 645 from 750 leaves us with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 12:
The number 645 fits into 1050 1 times, leaving a remainder of 405.
Use 1 as the next digit of our solution. 
Result so far: 89109.0511
Subtract 645 from 1050 to get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

The final outcome is 89109.0511, with a leftover of 0.00405.