Let's divide 121485 by 7
We want to divide 121485 by 7.

Step 1:
7 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 7

Advancing to step 2:
12 divided by 7 is 1 with a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 7 from 12 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 7

On to step 3:
If we divide 51 by 7, we get 7 and a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 17.0
Deduct 49 from 51 and we're left with 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 7

Moving on to step 4:
If we divide 24 by 7, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 173.0
Subtract 21 from 24 to get 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 7

On to step 5:
When dividing 38 by 7, we get 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 1735.0
Subtract 35 from 38 to get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 7

Moving on to step 6:
The number 7 fits into 35 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 17355.0
If we take 35 away from 35, 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.

Advancing to step 7:
When dividing 0 by 7, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 17355.0
Subtract 0 from 0 to 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.

Advancing to step 8:
7 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 17355.0
Subtract 0 from 0 to 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.

The final outcome is 17355.0, with a leftover of 0.0.