We're dividing 78399870 by 460 
We want to figure out the number of times 78399870 can be divided by 460.

Let's proceed to step 1:
The number 460 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 460

Going ahead to step 2:
If we divide 78 by 460, we get 0 and 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.
Append the next digit (3) from the dividend to 78 and continue with: 783 / 460

Advancing to step 3:
If we divide 783 by 460, we get 1 and a remainder of 323.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 460 from 783 and we're left with 323.
Append the next digit (9) from the dividend to 323 and continue with: 3239 / 460

Going ahead to step 4:
460 can be fit into 3239 7 times, resulting in a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 3220 away from 3239, we end up with 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 460

Advancing to step 5:
460 can be fit into 199 0 times, resulting in a remainder of 199.
The next digit of our result is 0. 
Result so far: 170.0
Subtracting 0 from 199 leaves us with 199.
Take the next digit (8) from the dividend and append it to 199, then repeat: 1998 / 460

Step 6:
460 goes into 1998 4 times with a remainder of 158.
Write down 4 as next digit of the result. 
Result so far: 1704.0
If we take 1840 away from 1998, we end up with 158.
Append the next digit (7) from the dividend to 158 and continue with: 1587 / 460

Let's proceed to step 7:
460 can be fit into 1587 3 times, resulting in a remainder of 207.
Write down 3 as next digit of the result. 
Result so far: 17043.0
Subtract 1380 from 1587 to get 207.
Take the next digit (0) from the dividend and append it to 207, then repeat: 2070 / 460

On to step 8:
The number 460 fits into 2070 4 times, leaving a remainder of 230.
Put 4 as the next digit of the answer. 
Result so far: 170434.0
Subtract 1840 from 2070 to get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 9:
460 goes into 2300 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 170434.5
The remainder is 0 after subtracting 2300 from 2300.
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 10:
460 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 170434.5
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.

Advancing to step 11:
0 divided by 460 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 170434.5
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.

After the division, we end up with 170434.5 and a remainder of 0.0.