We're dividing 67556780 by 645 
We want to figure out the number of times 67556780 can be divided by 645.

Let's proceed to step 1:
The number 645 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 645

On to step 2:
645 can be fit into 67 0 times, resulting in a remainder of 67.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 67, we end up with 67.
Bring next digit (5) of the dividend behind the 67 and repeat the process: 675 / 645

Advancing to step 3:
The number 645 fits into 675 1 times, leaving a remainder of 30.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 645 from 675, we get 30.
Bring next digit (5) of the dividend behind the 30 and repeat the process: 305 / 645

Step 4:
305 divided by 645 is 0 with a remainder of 305.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 305 leaves us with 305.
Bring next digit (6) of the dividend behind the 305 and repeat the process: 3056 / 645

Advancing to step 5:
3056 divided by 645 is 4 with a remainder of 476.
Put 4 as the next digit of the answer. 
Result so far: 104.0
Subtract 2580 from 3056 to get 476.
Take the next digit (7) from the dividend and append it to 476, then repeat: 4767 / 645

Moving on to step 6:
645 goes into 4767 7 times with a remainder of 252.
Use 7 as the next digit of our solution. 
Result so far: 1047.0
The remainder is 252 after subtracting 4515 from 4767.
Bring next digit (8) of the dividend behind the 252 and repeat the process: 2528 / 645

On to step 7:
If we divide 2528 by 645, we get 3 and a remainder of 593.
The next digit of our result is 3. 
Result so far: 10473.0
If we take 1935 away from 2528, we end up with 593.
Fetch the next digit (0) from the dividend, attach it to 593 and continue: 5930 / 645

Step 8:
645 goes into 5930 9 times with a remainder of 125.
The number 9 becomes the next digit in our result. 
Result so far: 104739.0
Subtracting 5805 from 5930 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Going ahead to step 9:
If we divide 1250 by 645, we get 1 and a remainder of 605.
The number 1 becomes the next digit in our result. 
Result so far: 104739.1
Subtracting 645 from 1250 leaves us with 605.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

Going ahead to step 10:
If we divide 6050 by 645, we get 9 and a remainder of 245.
Write down 9 as next digit of the result. 
Result so far: 104739.19
Deduct 5805 from 6050 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Moving on to step 11:
If we divide 2450 by 645, we get 3 and a remainder of 515.
The next digit of our result is 3. 
Result so far: 104739.193
If we subtract 1935 from 2450, we get 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 12:
If we divide 5150 by 645, we get 7 and a remainder of 635.
Record the quotient 7 as the next digit in the result. 
Result so far: 104739.1937
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.

On to step 13:
645 goes into 6350 9 times with a remainder of 545.
Write down 9 as next digit of the result. 
Result so far: 104739.19379
The remainder is 545 after subtracting 5805 from 6350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Advancing to step 14:
645 can be fit into 5450 8 times, resulting in a remainder of 290.
The next digit of our result is 8. 
Result so far: 104739.193798
Subtract 5160 from 5450 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 15:
When dividing 2900 by 645, we get 4 with a remainder of 320.
The next digit of our result is 4. 
Result so far: 104739.1937984
If we subtract 2580 from 2900, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 16:
The number 645 fits into 3200 4 times, leaving a remainder of 620.
Use 4 as the next digit of our solution. 
Result so far: 104739.19379844
Deduct 2580 from 3200 and we're left with 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 result is 104739.19379844 with a remainder of 6.2e-07.