We're dividing 15783980 by 738 
We want to figure out the number of times 15783980 can be divided by 738.

Step 1:
1 divided by 738 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 738

Advancing to step 2:
If we divide 15 by 738, we get 0 and a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 738

Advancing to step 3:
738 goes into 157 0 times with a remainder of 157.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 157, we end up with 157.
Append the next digit (8) from the dividend to 157 and continue with: 1578 / 738

Let's proceed to step 4:
1578 divided by 738 is 2 with a remainder of 102.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 1476 from 1578, we get 102.
Fetch the next digit (3) from the dividend, attach it to 102 and continue: 1023 / 738

On to step 5:
738 can be fit into 1023 1 times, resulting in a remainder of 285.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
The remainder is 285 after subtracting 738 from 1023.
Take the next digit (9) from the dividend and append it to 285, then repeat: 2859 / 738

Step 6:
The number 738 fits into 2859 3 times, leaving a remainder of 645.
The next digit of our result is 3. 
Result so far: 213.0
Subtract 2214 from 2859 to get 645.
Include the next digit (8) from the dividend after 645, then repeat: 6458 / 738

Moving on to step 7:
738 can be fit into 6458 8 times, resulting in a remainder of 554.
The number 8 becomes the next digit in our result. 
Result so far: 2138.0
Subtracting 5904 from 6458 leaves us with 554.
Append the next digit (0) from the dividend to 554 and continue with: 5540 / 738

Step 8:
5540 divided by 738 is 7 with a remainder of 374.
The next digit of our result is 7. 
Result so far: 21387.0
If we take 5166 away from 5540, we end up with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Let's proceed to step 9:
The number 738 fits into 3740 5 times, leaving a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 21387.5
Deduct 3690 from 3740 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 10:
The number 738 fits into 500 0 times, leaving a remainder of 500.
Write down 0 as next digit of the result. 
Result so far: 21387.5
The remainder is 500 after subtracting 0 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Let's proceed to step 11:
738 can be fit into 5000 6 times, resulting in a remainder of 572.
Record the quotient 6 as the next digit in the result. 
Result so far: 21387.506
Subtract 4428 from 5000 to get 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

On to step 12:
The number 738 fits into 5720 7 times, leaving a remainder of 554.
Use 7 as the next digit of our solution. 
Result so far: 21387.5067
If we subtract 5166 from 5720, we get 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Step 13:
5540 divided by 738 is 7 with a remainder of 374.
Write down 7 as next digit of the result. 
Result so far: 21387.50677
If we take 5166 away from 5540, we end up with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Our division results in 21387.50677 with a remaining 0.000374.