561643 divided by 78 
We're looking to find how many times 78 goes into 561643.

Step 1:
78 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (6) of the dividend behind the 5 and repeat the process: 56 / 78

Advancing to step 2:
78 can be fit into 56 0 times, resulting in a remainder of 56.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 56, we get 56.
Take the next digit (1) from the dividend and append it to 56, then repeat: 561 / 78

Step 3:
When dividing 561 by 78, we get 7 with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 546 from 561 to get 15.
Fetch the next digit (6) from the dividend, attach it to 15 and continue: 156 / 78

Going ahead to step 4:
78 can be fit into 156 2 times, resulting in a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 72.0
Deduct 156 from 156 and we're left with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 78

On to step 5:
78 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 720.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 78

Advancing to step 6:
43 divided by 78 is 0 with a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 7200.0
The remainder is 43 after subtracting 0 from 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
The number 78 fits into 430 5 times, leaving a remainder of 40.
Record the quotient 5 as the next digit in the result. 
Result so far: 7200.5
Deduct 390 from 430 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
400 divided by 78 is 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 7200.55
Subtracting 390 from 400 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 7200.55 with a remaining 0.01.