Let's divide 551921 by 78
We want to divide 551921 by 78.

Step 1:
78 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 78

Advancing to step 2:
78 can be fit into 55 0 times, resulting in a remainder of 55.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Bring next digit (1) of the dividend behind the 55 and repeat the process: 551 / 78

Step 3:
If we divide 551 by 78, we get 7 and a remainder of 5.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 5 after subtracting 546 from 551.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 78

Step 4:
59 divided by 78 is 0 with a remainder of 59.
The next digit of our result is 0. 
Result so far: 70.0
The remainder is 59 after subtracting 0 from 59.
Take the next digit (2) from the dividend and append it to 59, then repeat: 592 / 78

Advancing to step 5:
592 divided by 78 is 7 with a remainder of 46.
Use 7 as the next digit of our solution. 
Result so far: 707.0
The remainder is 46 after subtracting 546 from 592.
Bring next digit (1) of the dividend behind the 46 and repeat the process: 461 / 78

Going ahead to step 6:
78 goes into 461 5 times with a remainder of 71.
Record the quotient 5 as the next digit in the result. 
Result so far: 7075.0
Subtract 390 from 461 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 7:
When dividing 710 by 78, we get 9 with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 7075.9
If we subtract 702 from 710, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
The number 78 fits into 80 1 times, leaving a remainder of 2.
The next digit of our result is 1. 
Result so far: 7075.91
If we take 78 away from 80, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
78 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 7075.91
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
200 divided by 78 is 2 with a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 7075.9102
Subtracting 156 from 200 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 11:
78 goes into 440 5 times with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 7075.91025
The remainder is 50 after subtracting 390 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 12:
500 divided by 78 is 6 with a remainder of 32.
The next digit of our result is 6. 
Result so far: 7075.910256
The remainder is 32 after subtracting 468 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 13:
78 goes into 320 4 times with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 7075.9102564
Deduct 312 from 320 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
78 can be fit into 80 1 times, resulting in a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 7075.91025641
If we subtract 78 from 80, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 7075.91025641 and a remainder of 2e-09.