We look at the division of 78605158 by 420 
We want to divide 78605158 by 420.

Advancing to step 1:
If we divide 7 by 420, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 420

On to step 2:
The number 420 fits into 78 0 times, leaving a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Append the next digit (6) from the dividend to 78 and continue with: 786 / 420

Going ahead to step 3:
If we divide 786 by 420, we get 1 and a remainder of 366.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 366 after subtracting 420 from 786.
Fetch the next digit (0) from the dividend, attach it to 366 and continue: 3660 / 420

On to step 4:
When dividing 3660 by 420, we get 8 with a remainder of 300.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we subtract 3360 from 3660, we get 300.
Grab the next digit (5) from the dividend, add it to 300, then carry on: 3005 / 420

Let's proceed to step 5:
420 goes into 3005 7 times with a remainder of 65.
Put 7 as the next digit of the answer. 
Result so far: 187.0
If we take 2940 away from 3005, we end up with 65.
Fetch the next digit (1) from the dividend, attach it to 65 and continue: 651 / 420

Advancing to step 6:
651 divided by 420 is 1 with a remainder of 231.
Record the quotient 1 as the next digit in the result. 
Result so far: 1871.0
Deduct 420 from 651 and we're left with 231.
Bring next digit (5) of the dividend behind the 231 and repeat the process: 2315 / 420

On to step 7:
If we divide 2315 by 420, we get 5 and a remainder of 215.
Use 5 as the next digit of our solution. 
Result so far: 18715.0
If we take 2100 away from 2315, we end up with 215.
Fetch the next digit (8) from the dividend, attach it to 215 and continue: 2158 / 420

Step 8:
When dividing 2158 by 420, we get 5 with a remainder of 58.
The number 5 becomes the next digit in our result. 
Result so far: 187155.0
Deduct 2100 from 2158 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 9:
580 divided by 420 is 1 with a remainder of 160.
Put 1 as the next digit of the answer. 
Result so far: 187155.1
If we subtract 420 from 580, 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.

Moving on to step 10:
1600 divided by 420 is 3 with a remainder of 340.
The number 3 becomes the next digit in our result. 
Result so far: 187155.13
Deduct 1260 from 1600 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

On to step 11:
3400 divided by 420 is 8 with a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 187155.138
Deduct 3360 from 3400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
420 can be fit into 400 0 times, resulting in a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 187155.138
If we take 0 away from 400, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 13:
4000 divided by 420 is 9 with a remainder of 220.
The number 9 becomes the next digit in our result. 
Result so far: 187155.13809
If we take 3780 away from 4000, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 14:
420 can be fit into 2200 5 times, resulting in a remainder of 100.
Use 5 as the next digit of our solution. 
Result so far: 187155.138095
Subtract 2100 from 2200 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 15:
The number 420 fits into 1000 2 times, leaving a remainder of 160.
The next digit of our result is 2. 
Result so far: 187155.1380952
If we subtract 840 from 1000, 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.

Let's proceed to step 16:
420 can be fit into 1600 3 times, resulting in a remainder of 340.
Put 3 as the next digit of the answer. 
Result so far: 187155.13809523
The remainder is 340 after subtracting 1260 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Our division results in 187155.13809523 with a remaining 3.4e-07.