We're dividing 121807 by 75 
We're looking to find how many times 75 goes into 121807.

On to step 1:
1 divided by 75 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 75

Step 2:
75 goes into 12 0 times with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 75

On to step 3:
The number 75 fits into 121 1 times, leaving a remainder of 46.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 75 away from 121, we end up with 46.
Append the next digit (8) from the dividend to 46 and continue with: 468 / 75

Advancing to step 4:
75 goes into 468 6 times with a remainder of 18.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtracting 450 from 468 leaves us with 18.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 75

On to step 5:
75 goes into 180 2 times with a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 162.0
If we subtract 150 from 180, we get 30.
Fetch the next digit (7) from the dividend, attach it to 30 and continue: 307 / 75

On to step 6:
75 can be fit into 307 4 times, resulting in a remainder of 7.
The next digit of our result is 4. 
Result so far: 1624.0
Deduct 300 from 307 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.

Moving on to step 7:
If we divide 70 by 75, we get 0 and a remainder of 70.
The next digit of our result is 0. 
Result so far: 1624.0
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
75 goes into 700 9 times with a remainder of 25.
The next digit of our result is 9. 
Result so far: 1624.09
The remainder is 25 after subtracting 675 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
If we divide 250 by 75, we get 3 and a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 1624.093
Subtract 225 from 250 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 10:
The number 75 fits into 250 3 times, leaving a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 1624.0933
Subtracting 225 from 250 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The quotient of the division is 1624.0933, and the remainder is 0.00025.