123945 ÷ 87 
We're looking to find how many times 87 goes into 123945.

Going ahead to step 1:
87 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 87

Advancing to step 2:
12 divided by 87 is 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 87

Moving on to step 3:
The number 87 fits into 123 1 times, leaving a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 36 after subtracting 87 from 123.
Append the next digit (9) from the dividend to 36 and continue with: 369 / 87

Going ahead to step 4:
87 goes into 369 4 times with a remainder of 21.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtracting 348 from 369 leaves us with 21.
Fetch the next digit (4) from the dividend, attach it to 21 and continue: 214 / 87

Step 5:
87 can be fit into 214 2 times, resulting in a remainder of 40.
The next digit of our result is 2. 
Result so far: 142.0
Deduct 174 from 214 and we're left with 40.
Grab the next digit (5) from the dividend, add it to 40, then carry on: 405 / 87

Moving on to step 6:
The number 87 fits into 405 4 times, leaving a remainder of 57.
The number 4 becomes the next digit in our result. 
Result so far: 1424.0
Subtract 348 from 405 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 7:
The number 87 fits into 570 6 times, leaving a remainder of 48.
Put 6 as the next digit of the answer. 
Result so far: 1424.6
The remainder is 48 after subtracting 522 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 8:
When dividing 480 by 87, we get 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 1424.65
Deduct 435 from 480 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 9:
If we divide 450 by 87, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 1424.655
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 final outcome is 1424.655, with a leftover of 0.0015.