Let's divide 87123 by 3
We're looking to find how many times 3 goes into 87123.

Going ahead to step 1:
When dividing 8 by 3, we get 2 with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 6 from 8 and we're left with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 3

On to step 2:
3 can be fit into 27 9 times, resulting in a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtract 27 from 27 to get 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 3

Moving on to step 3:
The number 3 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 290.0
If we take 0 away from 1, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 3

Moving on to step 4:
12 divided by 3 is 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 2904.0
Subtract 12 from 12 to get 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 3

Moving on to step 5:
3 can be fit into 3 1 times, resulting in a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 29041.0
Deduct 3 from 3 and we're left 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 6:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 29041.0
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.

Step 7:
3 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 29041.0
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.

Our division results in 29041.0 with a remaining 0.0.