Let's divide 75115436 by 21
Our goal is to divide 75115436 by 21.

On to step 1:
21 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 21

Moving on to step 2:
21 goes into 75 3 times with a remainder of 12.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 63 from 75 leaves us with 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 21

Going ahead to step 3:
When dividing 121 by 21, we get 5 with a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
If we subtract 105 from 121, we get 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 21

Going ahead to step 4:
161 divided by 21 is 7 with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 357.0
Subtract 147 from 161 to get 14.
Take the next digit (5) from the dividend and append it to 14, then repeat: 145 / 21

Going ahead to step 5:
When dividing 145 by 21, we get 6 with a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 3576.0
The remainder is 19 after subtracting 126 from 145.
Take the next digit (4) from the dividend and append it to 19, then repeat: 194 / 21

Step 6:
21 goes into 194 9 times with a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 35769.0
Subtract 189 from 194 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 21

On to step 7:
21 goes into 53 2 times with a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 357692.0
Subtract 42 from 53 to get 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 21

Moving on to step 8:
When dividing 116 by 21, we get 5 with a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 3576925.0
Subtract 105 from 116 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 9:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 3576925.5
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
21 goes into 50 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 3576925.52
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3576925.523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
21 goes into 170 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 3576925.5238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 3576925.5238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 14:
21 goes into 200 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 3576925.523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 15:
110 divided by 21 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 3576925.5238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 16:
When dividing 50 by 21, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 3576925.52380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 3576925.52380952 with a remainder of 8e-09.