78699749 ÷ 644 
We want to divide 78699749 by 644.

On to step 1:
When dividing 7 by 644, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 644

Going ahead to step 2:
644 goes into 78 0 times with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Append the next digit (6) from the dividend to 78 and continue with: 786 / 644

On to step 3:
When dividing 786 by 644, we get 1 with a remainder of 142.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 142 after subtracting 644 from 786.
Grab the next digit (9) from the dividend, add it to 142, then carry on: 1429 / 644

Advancing to step 4:
The number 644 fits into 1429 2 times, leaving a remainder of 141.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 141 after subtracting 1288 from 1429.
Bring next digit (9) of the dividend behind the 141 and repeat the process: 1419 / 644

On to step 5:
644 can be fit into 1419 2 times, resulting in a remainder of 131.
Use 2 as the next digit of our solution. 
Result so far: 122.0
The remainder is 131 after subtracting 1288 from 1419.
Include the next digit (7) from the dividend after 131, then repeat: 1317 / 644

On to step 6:
644 goes into 1317 2 times with a remainder of 29.
The number 2 becomes the next digit in our result. 
Result so far: 1222.0
If we subtract 1288 from 1317, we get 29.
Bring next digit (4) of the dividend behind the 29 and repeat the process: 294 / 644

Step 7:
The number 644 fits into 294 0 times, leaving a remainder of 294.
Use 0 as the next digit of our solution. 
Result so far: 12220.0
Deduct 0 from 294 and we're left with 294.
Include the next digit (9) from the dividend after 294, then repeat: 2949 / 644

Advancing to step 8:
644 can be fit into 2949 4 times, resulting in a remainder of 373.
Write down 4 as next digit of the result. 
Result so far: 122204.0
Deduct 2576 from 2949 and we're left with 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3730, and continue the process.

On to step 9:
3730 divided by 644 is 5 with a remainder of 510.
Use 5 as the next digit of our solution. 
Result so far: 122204.5
Subtract 3220 from 3730 to get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Step 10:
If we divide 5100 by 644, we get 7 and a remainder of 592.
Use 7 as the next digit of our solution. 
Result so far: 122204.57
If we take 4508 away from 5100, we end up with 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Moving on to step 11:
5920 divided by 644 is 9 with a remainder of 124.
The next digit of our result is 9. 
Result so far: 122204.579
The remainder is 124 after subtracting 5796 from 5920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 12:
644 can be fit into 1240 1 times, resulting in a remainder of 596.
Write down 1 as next digit of the result. 
Result so far: 122204.5791
The remainder is 596 after subtracting 644 from 1240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Step 13:
When dividing 5960 by 644, we get 9 with a remainder of 164.
The next digit of our result is 9. 
Result so far: 122204.57919
The remainder is 164 after subtracting 5796 from 5960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

On to step 14:
644 can be fit into 1640 2 times, resulting in a remainder of 352.
Use 2 as the next digit of our solution. 
Result so far: 122204.579192
Deduct 1288 from 1640 and we're left with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 15:
If we divide 3520 by 644, we get 5 and a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 122204.5791925
Subtracting 3220 from 3520 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 16:
The number 644 fits into 3000 4 times, leaving a remainder of 424.
Write down 4 as next digit of the result. 
Result so far: 122204.57919254
Subtract 2576 from 3000 to get 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Our division results in 122204.57919254 with a remaining 4.24e-07.