We divide 12001580 by 320
We want to figure out the number of times 12001580 can be divided by 320.

Moving on to step 1:
1 divided by 320 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 320

On to step 2:
12 divided by 320 is 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 320

On to step 3:
320 goes into 120 0 times with a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 120 leaves us with 120.
Append the next digit (0) from the dividend to 120 and continue with: 1200 / 320

Advancing to step 4:
320 can be fit into 1200 3 times, resulting in a remainder of 240.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 960 from 1200, we get 240.
Append the next digit (1) from the dividend to 240 and continue with: 2401 / 320

Advancing to step 5:
If we divide 2401 by 320, we get 7 and a remainder of 161.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
Subtract 2240 from 2401 to get 161.
Bring next digit (5) of the dividend behind the 161 and repeat the process: 1615 / 320

Step 6:
When dividing 1615 by 320, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 375.0
If we subtract 1600 from 1615, we get 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 320

Moving on to step 7:
If we divide 158 by 320, we get 0 and a remainder of 158.
Write down 0 as next digit of the result. 
Result so far: 3750.0
Subtracting 0 from 158 leaves us with 158.
Grab the next digit (0) from the dividend, add it to 158, then carry on: 1580 / 320

Step 8:
When dividing 1580 by 320, we get 4 with a remainder of 300.
Record the quotient 4 as the next digit in the result. 
Result so far: 37504.0
Deduct 1280 from 1580 and we're left 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.

Going ahead to step 9:
If we divide 3000 by 320, we get 9 and a remainder of 120.
The next digit of our result is 9. 
Result so far: 37504.9
Deduct 2880 from 3000 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 10:
320 can be fit into 1200 3 times, resulting in a remainder of 240.
Put 3 as the next digit of the answer. 
Result so far: 37504.93
Deduct 960 from 1200 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 11:
When dividing 2400 by 320, we get 7 with a remainder of 160.
Put 7 as the next digit of the answer. 
Result so far: 37504.937
If we subtract 2240 from 2400, we 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.

On to step 12:
320 can be fit into 1600 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 37504.9375
If we subtract 1600 from 1600, we 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.

Let's proceed to step 13:
The number 320 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 37504.9375
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 14:
320 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 37504.9375
If we subtract 0 from 0, we 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 37504.9375 and a remainder of 0.0.