53880992 divided by 645 
Let's see how many times 645 fits into 53880992.

Going ahead to step 1:
If we divide 5 by 645, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 645

Step 2:
If we divide 53 by 645, we get 0 and a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Grab the next digit (8) from the dividend, add it to 53, then carry on: 538 / 645

Step 3:
When dividing 538 by 645, we get 0 with a remainder of 538.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 538 after subtracting 0 from 538.
Bring next digit (8) of the dividend behind the 538 and repeat the process: 5388 / 645

On to step 4:
645 can be fit into 5388 8 times, resulting in a remainder of 228.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 5160 from 5388, we get 228.
Bring next digit (0) of the dividend behind the 228 and repeat the process: 2280 / 645

On to step 5:
645 goes into 2280 3 times with a remainder of 345.
Use 3 as the next digit of our solution. 
Result so far: 83.0
Subtracting 1935 from 2280 leaves us with 345.
Include the next digit (9) from the dividend after 345, then repeat: 3459 / 645

Let's proceed to step 6:
645 can be fit into 3459 5 times, resulting in a remainder of 234.
The next digit of our result is 5. 
Result so far: 835.0
If we take 3225 away from 3459, we end up with 234.
Grab the next digit (9) from the dividend, add it to 234, then carry on: 2349 / 645

Going ahead to step 7:
If we divide 2349 by 645, we get 3 and a remainder of 414.
The number 3 becomes the next digit in our result. 
Result so far: 8353.0
Subtract 1935 from 2349 to get 414.
Append the next digit (2) from the dividend to 414 and continue with: 4142 / 645

Advancing to step 8:
645 goes into 4142 6 times with a remainder of 272.
Put 6 as the next digit of the answer. 
Result so far: 83536.0
The remainder is 272 after subtracting 3870 from 4142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Step 9:
645 can be fit into 2720 4 times, resulting in a remainder of 140.
Record the quotient 4 as the next digit in the result. 
Result so far: 83536.4
Deduct 2580 from 2720 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 10:
When dividing 1400 by 645, we get 2 with a remainder of 110.
Write down 2 as next digit of the result. 
Result so far: 83536.42
Subtract 1290 from 1400 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 11:
If we divide 1100 by 645, we get 1 and a remainder of 455.
The number 1 becomes the next digit in our result. 
Result so far: 83536.421
Subtract 645 from 1100 to get 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Let's proceed to step 12:
645 goes into 4550 7 times with a remainder of 35.
Use 7 as the next digit of our solution. 
Result so far: 83536.4217
If we take 4515 away from 4550, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 13:
645 goes into 350 0 times with a remainder of 350.
The number 0 becomes the next digit in our result. 
Result so far: 83536.4217
If we subtract 0 from 350, we get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 14:
3500 divided by 645 is 5 with a remainder of 275.
Write down 5 as next digit of the result. 
Result so far: 83536.421705
If we subtract 3225 from 3500, we get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Advancing to step 15:
If we divide 2750 by 645, we get 4 and a remainder of 170.
The number 4 becomes the next digit in our result. 
Result so far: 83536.4217054
Deduct 2580 from 2750 and we're left with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 16:
If we divide 1700 by 645, we get 2 and a remainder of 410.
The number 2 becomes the next digit in our result. 
Result so far: 83536.42170542
Subtract 1290 from 1700 to get 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

After the division, we end up with 83536.42170542 and a remainder of 4.1e-07.