Let's divide 3447978 by 645
We want to figure out the number of times 3447978 can be divided by 645.

Going ahead to step 1:
3 divided by 645 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 645

Moving on to step 2:
The number 645 fits into 34 0 times, leaving a remainder of 34.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 34 after subtracting 0 from 34.
Include the next digit (4) from the dividend after 34, then repeat: 344 / 645

Let's proceed to step 3:
344 divided by 645 is 0 with a remainder of 344.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 344, we end up with 344.
Include the next digit (7) from the dividend after 344, then repeat: 3447 / 645

Step 4:
645 can be fit into 3447 5 times, resulting in a remainder of 222.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 3225 from 3447, we get 222.
Take the next digit (9) from the dividend and append it to 222, then repeat: 2229 / 645

Moving on to step 5:
When dividing 2229 by 645, we get 3 with a remainder of 294.
Write down 3 as next digit of the result. 
Result so far: 53.0
If we subtract 1935 from 2229, we get 294.
Grab the next digit (7) from the dividend, add it to 294, then carry on: 2947 / 645

Step 6:
2947 divided by 645 is 4 with a remainder of 367.
Use 4 as the next digit of our solution. 
Result so far: 534.0
The remainder is 367 after subtracting 2580 from 2947.
Bring next digit (8) of the dividend behind the 367 and repeat the process: 3678 / 645

Going ahead to step 7:
645 can be fit into 3678 5 times, resulting in a remainder of 453.
Put 5 as the next digit of the answer. 
Result so far: 5345.0
Deduct 3225 from 3678 and we're left with 453.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

On to step 8:
645 goes into 4530 7 times with a remainder of 15.
Write down 7 as next digit of the result. 
Result so far: 5345.7
If we subtract 4515 from 4530, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 9:
645 goes into 150 0 times with a remainder of 150.
Record the quotient 0 as the next digit in the result. 
Result so far: 5345.7
Subtract 0 from 150 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Moving on to step 10:
The number 645 fits into 1500 2 times, leaving a remainder of 210.
Write down 2 as next digit of the result. 
Result so far: 5345.702
Subtracting 1290 from 1500 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Let's proceed to step 11:
The number 645 fits into 2100 3 times, leaving a remainder of 165.
Put 3 as the next digit of the answer. 
Result so far: 5345.7023
Deduct 1935 from 2100 and we're left with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Advancing to step 12:
645 can be fit into 1650 2 times, resulting in a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 5345.70232
If we take 1290 away from 1650, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 13:
645 can be fit into 3600 5 times, resulting in a remainder of 375.
Use 5 as the next digit of our solution. 
Result so far: 5345.702325
Subtract 3225 from 3600 to get 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 14:
The number 645 fits into 3750 5 times, leaving a remainder of 525.
Record the quotient 5 as the next digit in the result. 
Result so far: 5345.7023255
Subtract 3225 from 3750 to get 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

The final result is 5345.7023255 with a remainder of 5.25e-06.