Let's divide 66195155 by 21
We want to divide 66195155 by 21.

Let's proceed to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 21

Moving on to step 2:
When dividing 66 by 21, we get 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 3 after subtracting 63 from 66.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 21

Moving on to step 3:
If we divide 31 by 21, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 31.0
If we subtract 21 from 31, we get 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 21

Moving on to step 4:
21 can be fit into 109 5 times, resulting in a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 315.0
Subtracting 105 from 109 leaves us with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 21

Going ahead to step 5:
If we divide 45 by 21, we get 2 and a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 3152.0
Subtracting 42 from 45 leaves us with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 21

Step 6:
The number 21 fits into 31 1 times, leaving a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 31521.0
Subtract 21 from 31 to get 10.
Bring next digit (5) of the dividend behind the 10 and repeat the process: 105 / 21

Advancing to step 7:
If we divide 105 by 21, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 315215.0
If we subtract 105 from 105, we get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 21

Moving on to step 8:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 3152150.0
Deduct 0 from 5 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 9:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 3152150.2
Subtracting 42 from 50 leaves us 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.

Moving on to step 10:
If we divide 80 by 21, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 3152150.23
If we take 63 away from 80, we end up 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.

Going ahead to step 11:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 3152150.238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
20 divided by 21 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 3152150.238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
If we divide 200 by 21, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 3152150.23809
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 3152150.238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 15:
When dividing 50 by 21, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 3152150.2380952
Subtract 42 from 50 to 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.

Step 16:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 3152150.23809523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 3152150.23809523, with a leftover of 1.7e-08.