55311845 ÷ 645 
We want to divide 55311845 by 645.

Going ahead to step 1:
When dividing 5 by 645, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 645

Going ahead to step 2:
645 goes into 55 0 times with a remainder of 55.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Take the next digit (3) from the dividend and append it to 55, then repeat: 553 / 645

Advancing to step 3:
645 can be fit into 553 0 times, resulting in a remainder of 553.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 553, we end up with 553.
Grab the next digit (1) from the dividend, add it to 553, then carry on: 5531 / 645

Going ahead to step 4:
645 goes into 5531 8 times with a remainder of 371.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 5160 from 5531 to get 371.
Append the next digit (1) from the dividend to 371 and continue with: 3711 / 645

Advancing to step 5:
If we divide 3711 by 645, we get 5 and a remainder of 486.
Record the quotient 5 as the next digit in the result. 
Result so far: 85.0
Subtract 3225 from 3711 to get 486.
Bring next digit (8) of the dividend behind the 486 and repeat the process: 4868 / 645

Step 6:
When dividing 4868 by 645, we get 7 with a remainder of 353.
Record the quotient 7 as the next digit in the result. 
Result so far: 857.0
Subtracting 4515 from 4868 leaves us with 353.
Append the next digit (4) from the dividend to 353 and continue with: 3534 / 645

Moving on to step 7:
If we divide 3534 by 645, we get 5 and a remainder of 309.
The number 5 becomes the next digit in our result. 
Result so far: 8575.0
Deduct 3225 from 3534 and we're left with 309.
Bring next digit (5) of the dividend behind the 309 and repeat the process: 3095 / 645

Going ahead to step 8:
If we divide 3095 by 645, we get 4 and a remainder of 515.
Write down 4 as next digit of the result. 
Result so far: 85754.0
Subtracting 2580 from 3095 leaves us with 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5150, and continue the process.

Step 9:
When dividing 5150 by 645, we get 7 with a remainder of 635.
Write down 7 as next digit of the result. 
Result so far: 85754.7
Subtract 4515 from 5150 to get 635.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

Advancing to step 10:
645 can be fit into 6350 9 times, resulting in a remainder of 545.
Use 9 as the next digit of our solution. 
Result so far: 85754.79
If we subtract 5805 from 6350, we get 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Moving on to step 11:
The number 645 fits into 5450 8 times, leaving a remainder of 290.
Put 8 as the next digit of the answer. 
Result so far: 85754.798
Subtracting 5160 from 5450 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 12:
If we divide 2900 by 645, we get 4 and a remainder of 320.
Record the quotient 4 as the next digit in the result. 
Result so far: 85754.7984
The remainder is 320 after subtracting 2580 from 2900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 13:
The number 645 fits into 3200 4 times, leaving a remainder of 620.
Record the quotient 4 as the next digit in the result. 
Result so far: 85754.79844
Subtract 2580 from 3200 to get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

The final outcome is 85754.79844, with a leftover of 0.00062.