We look at the division of 423051 by 87 
We want to divide 423051 by 87.

Moving on to step 1:
If we divide 4 by 87, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 87

Going ahead to step 2:
When dividing 42 by 87, we get 0 with a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Include the next digit (3) from the dividend after 42, then repeat: 423 / 87

Step 3:
87 can be fit into 423 4 times, resulting in a remainder of 75.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 348 from 423 and we're left with 75.
Fetch the next digit (0) from the dividend, attach it to 75 and continue: 750 / 87

Advancing to step 4:
750 divided by 87 is 8 with a remainder of 54.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Deduct 696 from 750 and we're left with 54.
Include the next digit (5) from the dividend after 54, then repeat: 545 / 87

Advancing to step 5:
545 divided by 87 is 6 with a remainder of 23.
Put 6 as the next digit of the answer. 
Result so far: 486.0
The remainder is 23 after subtracting 522 from 545.
Grab the next digit (1) from the dividend, add it to 23, then carry on: 231 / 87

Going ahead to step 6:
If we divide 231 by 87, we get 2 and a remainder of 57.
Record the quotient 2 as the next digit in the result. 
Result so far: 4862.0
Deduct 174 from 231 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 7:
570 divided by 87 is 6 with a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 4862.6
Subtracting 522 from 570 leaves us with 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 8:
The number 87 fits into 480 5 times, leaving a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 4862.65
If we subtract 435 from 480, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 9:
87 goes into 450 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 4862.655
The remainder is 15 after subtracting 435 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The quotient of the division is 4862.655, and the remainder is 0.0015.