Let's divide 742221 by 21
We're looking to find how many times 21 goes into 742221.

Going ahead to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 21

Moving on to step 2:
21 goes into 74 3 times with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 74, we end up with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 21

Advancing to step 3:
21 can be fit into 112 5 times, resulting in a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 35.0
If we subtract 105 from 112, we get 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 21

Advancing to step 4:
If we divide 72 by 21, we get 3 and a remainder of 9.
The next digit of our result is 3. 
Result so far: 353.0
Subtract 63 from 72 to get 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 21

Advancing to step 5:
When dividing 92 by 21, we get 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 3534.0
Subtract 84 from 92 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 21

Let's proceed to step 6:
21 can be fit into 81 3 times, resulting in a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 35343.0
If we subtract 63 from 81, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
21 goes into 180 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 35343.8
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 35343.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 35343.857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
30 divided by 21 is 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 35343.8571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 11:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 35343.85714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
When dividing 60 by 21, we get 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 35343.857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 13:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 35343.8571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
21 goes into 120 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 35343.85714285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 35343.85714285 with a remainder of 1.5e-08.