We're dividing 12120253 by 9 
Let's see how many times 9 fits into 12120253.

On to step 1:
The number 9 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 9

Moving on to step 2:
If we divide 12 by 9, we get 1 and a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 9 away from 12, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 9

Step 3:
If we divide 31 by 9, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we take 27 away from 31, we end up with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 9

Advancing to step 4:
When dividing 42 by 9, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 134.0
Subtract 36 from 42 to get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 9

Going ahead to step 5:
The number 9 fits into 60 6 times, leaving a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 1346.0
Deduct 54 from 60 and we're left with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 9

On to step 6:
9 goes into 62 6 times with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 13466.0
If we take 54 away from 62, we end up with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 9

Step 7:
The number 9 fits into 85 9 times, leaving a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 134669.0
If we subtract 81 from 85, we get 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 9

On to step 8:
The number 9 fits into 43 4 times, leaving a remainder of 7.
The next digit of our result is 4. 
Result so far: 1346694.0
Subtracting 36 from 43 leaves us 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.

Going ahead to step 9:
9 can be fit into 70 7 times, resulting in a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 1346694.7
Deduct 63 from 70 and we're left 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.

Step 10:
9 can be fit into 70 7 times, resulting in a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 1346694.77
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final outcome is 1346694.77, with a leftover of 0.007.