We're dividing 121487 by 10 
Let's see how many times 10 fits into 121487.

Advancing to step 1:
10 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 10

Step 2:
10 can be fit into 12 1 times, resulting in a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 10 from 12 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 10

Advancing to step 3:
When dividing 21 by 10, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 12.0
Subtract 20 from 21 to get 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 10

On to step 4:
If we divide 14 by 10, we get 1 and a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 121.0
Subtract 10 from 14 to get 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 10

On to step 5:
The number 10 fits into 48 4 times, leaving a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 1214.0
Subtract 40 from 48 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 10

On to step 6:
87 divided by 10 is 8 with a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 12148.0
If we take 80 away from 87, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
10 goes into 70 7 times with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 12148.7
Subtracting 70 from 70 leaves us 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.

Moving on to step 8:
When dividing 0 by 10, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12148.7
Deduct 0 from 0 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.

On to step 9:
10 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12148.7
The remainder is 0 after subtracting 0 from 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 result is 12148.7 with a remainder of 0.0.