78266099 divided by 644 
Let's see how many times 644 fits into 78266099.

Moving on to step 1:
7 divided by 644 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 644

Let's proceed to step 2:
The number 644 fits into 78 0 times, leaving a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Append the next digit (2) from the dividend to 78 and continue with: 782 / 644

On to step 3:
If we divide 782 by 644, we get 1 and a remainder of 138.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 644 away from 782, we end up with 138.
Fetch the next digit (6) from the dividend, attach it to 138 and continue: 1386 / 644

Let's proceed to step 4:
644 goes into 1386 2 times with a remainder of 98.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 1288 from 1386, we get 98.
Append the next digit (6) from the dividend to 98 and continue with: 986 / 644

Moving on to step 5:
The number 644 fits into 986 1 times, leaving a remainder of 342.
The number 1 becomes the next digit in our result. 
Result so far: 121.0
Subtract 644 from 986 to get 342.
Take the next digit (0) from the dividend and append it to 342, then repeat: 3420 / 644

Let's proceed to step 6:
644 goes into 3420 5 times with a remainder of 200.
Write down 5 as next digit of the result. 
Result so far: 1215.0
Subtract 3220 from 3420 to get 200.
Include the next digit (9) from the dividend after 200, then repeat: 2009 / 644

Let's proceed to step 7:
The number 644 fits into 2009 3 times, leaving a remainder of 77.
The next digit of our result is 3. 
Result so far: 12153.0
If we subtract 1932 from 2009, we get 77.
Include the next digit (9) from the dividend after 77, then repeat: 779 / 644

Going ahead to step 8:
644 goes into 779 1 times with a remainder of 135.
Put 1 as the next digit of the answer. 
Result so far: 121531.0
The remainder is 135 after subtracting 644 from 779.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Step 9:
644 goes into 1350 2 times with a remainder of 62.
Write down 2 as next digit of the result. 
Result so far: 121531.2
If we subtract 1288 from 1350, we get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 10:
644 can be fit into 620 0 times, resulting in a remainder of 620.
Use 0 as the next digit of our solution. 
Result so far: 121531.2
Deduct 0 from 620 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.

Step 11:
The number 644 fits into 6200 9 times, leaving a remainder of 404.
Record the quotient 9 as the next digit in the result. 
Result so far: 121531.209
Deduct 5796 from 6200 and we're left with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Going ahead to step 12:
The number 644 fits into 4040 6 times, leaving a remainder of 176.
Write down 6 as next digit of the result. 
Result so far: 121531.2096
If we take 3864 away from 4040, we end up with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Advancing to step 13:
When dividing 1760 by 644, we get 2 with a remainder of 472.
Put 2 as the next digit of the answer. 
Result so far: 121531.20962
Subtracting 1288 from 1760 leaves us with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

On to step 14:
The number 644 fits into 4720 7 times, leaving a remainder of 212.
Put 7 as the next digit of the answer. 
Result so far: 121531.209627
If we subtract 4508 from 4720, we get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Advancing to step 15:
The number 644 fits into 2120 3 times, leaving a remainder of 188.
The number 3 becomes the next digit in our result. 
Result so far: 121531.2096273
Deduct 1932 from 2120 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Advancing to step 16:
When dividing 1880 by 644, we get 2 with a remainder of 592.
The next digit of our result is 2. 
Result so far: 121531.20962732
The remainder is 592 after subtracting 1288 from 1880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

The quotient of the division is 121531.20962732, and the remainder is 5.92e-07.