We look at the division of 21503965 by 120 
We're looking to find how many times 120 goes into 21503965.

Let's proceed to step 1:
The number 120 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 120

On to step 2:
120 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 120

Advancing to step 3:
The number 120 fits into 215 1 times, leaving a remainder of 95.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 120 from 215 and we're left with 95.
Append the next digit (0) from the dividend to 95 and continue with: 950 / 120

Advancing to step 4:
When dividing 950 by 120, we get 7 with a remainder of 110.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 840 from 950, we get 110.
Bring next digit (3) of the dividend behind the 110 and repeat the process: 1103 / 120

Step 5:
1103 divided by 120 is 9 with a remainder of 23.
Put 9 as the next digit of the answer. 
Result so far: 179.0
The remainder is 23 after subtracting 1080 from 1103.
Include the next digit (9) from the dividend after 23, then repeat: 239 / 120

Step 6:
239 divided by 120 is 1 with a remainder of 119.
Write down 1 as next digit of the result. 
Result so far: 1791.0
The remainder is 119 after subtracting 120 from 239.
Fetch the next digit (6) from the dividend, attach it to 119 and continue: 1196 / 120

On to step 7:
When dividing 1196 by 120, we get 9 with a remainder of 116.
Put 9 as the next digit of the answer. 
Result so far: 17919.0
Subtracting 1080 from 1196 leaves us with 116.
Take the next digit (5) from the dividend and append it to 116, then repeat: 1165 / 120

On to step 8:
1165 divided by 120 is 9 with a remainder of 85.
The next digit of our result is 9. 
Result so far: 179199.0
If we take 1080 away from 1165, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Moving on to step 9:
120 goes into 850 7 times with a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 179199.7
Subtract 840 from 850 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 10:
The number 120 fits into 100 0 times, leaving a remainder of 100.
The next digit of our result is 0. 
Result so far: 179199.7
If we take 0 away from 100, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 11:
120 can be fit into 1000 8 times, resulting in a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 179199.708
Subtracting 960 from 1000 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
120 goes into 400 3 times with a remainder of 40.
Put 3 as the next digit of the answer. 
Result so far: 179199.7083
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 13:
When dividing 400 by 120, we get 3 with a remainder of 40.
The next digit of our result is 3. 
Result so far: 179199.70833
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 179199.70833, with a leftover of 4e-05.