66611629 ÷ 21 
We're looking to find how many times 21 goes into 66611629.

Going ahead to step 1:
21 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 21

Advancing to step 2:
21 goes into 66 3 times with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 63 away from 66, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 21

Let's proceed to step 3:
21 can be fit into 36 1 times, resulting in a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
If we subtract 21 from 36, we get 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 21

Going ahead to step 4:
The number 21 fits into 151 7 times, leaving a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 317.0
If we take 147 away from 151, we end up with 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Moving on to step 5:
41 divided by 21 is 1 with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 3171.0
If we take 21 away from 41, we end up with 20.
Append the next digit (6) from the dividend to 20 and continue with: 206 / 21

Going ahead to step 6:
206 divided by 21 is 9 with a remainder of 17.
The next digit of our result is 9. 
Result so far: 31719.0
Subtract 189 from 206 to get 17.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 21

Advancing to step 7:
When dividing 172 by 21, we get 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 317198.0
If we take 168 away from 172, we end up with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 21

Advancing to step 8:
21 can be fit into 49 2 times, resulting in a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 3171982.0
The remainder is 7 after subtracting 42 from 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 9:
If we divide 70 by 21, we get 3 and a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 3171982.3
If we take 63 away from 70, we end up 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.

Advancing to step 10:
70 divided by 21 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 3171982.33
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 3171982.33, and the remainder is 0.007.