Let's divide 78373709 by 640
We want to divide 78373709 by 640.

Advancing to step 1:
640 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 640

Let's proceed to step 2:
The number 640 fits into 78 0 times, leaving a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Grab the next digit (3) from the dividend, add it to 78, then carry on: 783 / 640

Advancing to step 3:
If we divide 783 by 640, we get 1 and a remainder of 143.
The next digit of our result is 1. 
Result so far: 1.0
If we take 640 away from 783, we end up with 143.
Grab the next digit (7) from the dividend, add it to 143, then carry on: 1437 / 640

On to step 4:
When dividing 1437 by 640, we get 2 with a remainder of 157.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 1280 from 1437 leaves us with 157.
Grab the next digit (3) from the dividend, add it to 157, then carry on: 1573 / 640

Advancing to step 5:
640 can be fit into 1573 2 times, resulting in a remainder of 293.
The number 2 becomes the next digit in our result. 
Result so far: 122.0
Subtracting 1280 from 1573 leaves us with 293.
Fetch the next digit (7) from the dividend, attach it to 293 and continue: 2937 / 640

Let's proceed to step 6:
If we divide 2937 by 640, we get 4 and a remainder of 377.
Put 4 as the next digit of the answer. 
Result so far: 1224.0
If we take 2560 away from 2937, we end up with 377.
Include the next digit (0) from the dividend after 377, then repeat: 3770 / 640

On to step 7:
640 goes into 3770 5 times with a remainder of 570.
The number 5 becomes the next digit in our result. 
Result so far: 12245.0
The remainder is 570 after subtracting 3200 from 3770.
Append the next digit (9) from the dividend to 570 and continue with: 5709 / 640

On to step 8:
640 can be fit into 5709 8 times, resulting in a remainder of 589.
The next digit of our result is 8. 
Result so far: 122458.0
Subtract 5120 from 5709 to get 589.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5890, and continue the process.

On to step 9:
640 goes into 5890 9 times with a remainder of 130.
Use 9 as the next digit of our solution. 
Result so far: 122458.9
If we take 5760 away from 5890, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 10:
640 goes into 1300 2 times with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 122458.92
Subtract 1280 from 1300 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
640 goes into 200 0 times with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 122458.92
Subtract 0 from 200 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 12:
2000 divided by 640 is 3 with a remainder of 80.
Record the quotient 3 as the next digit in the result. 
Result so far: 122458.9203
Subtracting 1920 from 2000 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 13:
The number 640 fits into 800 1 times, leaving a remainder of 160.
Use 1 as the next digit of our solution. 
Result so far: 122458.92031
Subtract 640 from 800 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 14:
When dividing 1600 by 640, we get 2 with a remainder of 320.
Use 2 as the next digit of our solution. 
Result so far: 122458.920312
Subtracting 1280 from 1600 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 15:
640 can be fit into 3200 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 122458.9203125
Subtract 3200 from 3200 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 16:
The number 640 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 122458.9203125
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 122458.9203125 and a remainder of 0.0.