642721 divided by 78 
Let's see how many times 78 fits into 642721.

Let's proceed to step 1:
6 divided by 78 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 78

Advancing to step 2:
The number 78 fits into 64 0 times, leaving a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Bring next digit (2) of the dividend behind the 64 and repeat the process: 642 / 78

On to step 3:
When dividing 642 by 78, we get 8 with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 624 from 642, we get 18.
Take the next digit (7) from the dividend and append it to 18, then repeat: 187 / 78

Let's proceed to step 4:
When dividing 187 by 78, we get 2 with a remainder of 31.
Record the quotient 2 as the next digit in the result. 
Result so far: 82.0
Subtracting 156 from 187 leaves us with 31.
Append the next digit (2) from the dividend to 31 and continue with: 312 / 78

Going ahead to step 5:
When dividing 312 by 78, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 824.0
Subtracting 312 from 312 leaves us with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 78

Advancing to step 6:
1 divided by 78 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 8240.0
Deduct 0 from 1 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
10 divided by 78 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 8240.0
Subtracting 0 from 10 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.

Let's proceed to step 8:
78 goes into 100 1 times with a remainder of 22.
Write down 1 as next digit of the result. 
Result so far: 8240.01
If we subtract 78 from 100, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 9:
78 can be fit into 220 2 times, resulting in a remainder of 64.
Put 2 as the next digit of the answer. 
Result so far: 8240.012
Deduct 156 from 220 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 10:
78 can be fit into 640 8 times, resulting in a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 8240.0128
If we subtract 624 from 640, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 11:
78 can be fit into 160 2 times, resulting in a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 8240.01282
If we subtract 156 from 160, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
When dividing 40 by 78, we get 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 8240.01282
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 13:
When dividing 400 by 78, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 8240.0128205
Deduct 390 from 400 and we're left 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.

Let's proceed to step 14:
When dividing 100 by 78, we get 1 with a remainder of 22.
The next digit of our result is 1. 
Result so far: 8240.01282051
Subtract 78 from 100 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final result is 8240.01282051 with a remainder of 2.2e-08.