423945 ÷ 86 
We want to figure out the number of times 423945 can be divided by 86.

Moving on to step 1:
If we divide 4 by 86, we get 0 and a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 86

Moving on to step 2:
If we divide 42 by 86, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Include the next digit (3) from the dividend after 42, then repeat: 423 / 86

Step 3:
When dividing 423 by 86, we get 4 with a remainder of 79.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 344 from 423 and we're left with 79.
Fetch the next digit (9) from the dividend, attach it to 79 and continue: 799 / 86

Step 4:
86 can be fit into 799 9 times, resulting in a remainder of 25.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
Subtracting 774 from 799 leaves us with 25.
Fetch the next digit (4) from the dividend, attach it to 25 and continue: 254 / 86

Step 5:
254 divided by 86 is 2 with a remainder of 82.
Record the quotient 2 as the next digit in the result. 
Result so far: 492.0
If we take 172 away from 254, we end up with 82.
Append the next digit (5) from the dividend to 82 and continue with: 825 / 86

Advancing to step 6:
86 can be fit into 825 9 times, resulting in a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 4929.0
Subtract 774 from 825 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 7:
510 divided by 86 is 5 with a remainder of 80.
Use 5 as the next digit of our solution. 
Result so far: 4929.5
Subtract 430 from 510 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 8:
800 divided by 86 is 9 with a remainder of 26.
The next digit of our result is 9. 
Result so far: 4929.59
Subtract 774 from 800 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 9:
86 can be fit into 260 3 times, resulting in a remainder of 2.
The next digit of our result is 3. 
Result so far: 4929.593
If we subtract 258 from 260, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
86 goes into 20 0 times with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 4929.593
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
When dividing 200 by 86, we get 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 4929.59302
If we subtract 172 from 200, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 12:
86 goes into 280 3 times with a remainder of 22.
The next digit of our result is 3. 
Result so far: 4929.593023
Subtract 258 from 280 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 13:
86 can be fit into 220 2 times, resulting in a remainder of 48.
The next digit of our result is 2. 
Result so far: 4929.5930232
If we subtract 172 from 220, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 14:
86 goes into 480 5 times with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 4929.59302325
The remainder is 50 after subtracting 430 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The quotient of the division is 4929.59302325, and the remainder is 5e-08.