742342 divided by 21 
Our goal is to divide 742342 by 21.

Advancing to step 1:
When dividing 7 by 21, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (4) from the dividend to 7 and continue with: 74 / 21

Let's proceed to step 2:
74 divided by 21 is 3 with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 11 after subtracting 63 from 74.
Grab the next digit (2) from the dividend, add it to 11, then carry on: 112 / 21

Advancing to step 3:
21 can be fit into 112 5 times, resulting in a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 35.0
If we subtract 105 from 112, we get 7.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 21

Step 4:
The number 21 fits into 73 3 times, leaving a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 353.0
Deduct 63 from 73 and we're left with 10.
Append the next digit (4) from the dividend to 10 and continue with: 104 / 21

Going ahead to step 5:
21 can be fit into 104 4 times, resulting in a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 3534.0
Subtract 84 from 104 to get 20.
Include the next digit (2) from the dividend after 20, then repeat: 202 / 21

On to step 6:
21 can be fit into 202 9 times, resulting in a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 35349.0
Subtract 189 from 202 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 7:
21 goes into 130 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 35349.6
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 35349.61
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 9:
If we divide 190 by 21, we get 9 and a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 35349.619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
21 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 35349.619
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 11:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 35349.61904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 12:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 35349.619047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 13:
21 goes into 130 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 35349.6190476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 14:
If we divide 40 by 21, we get 1 and a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 35349.61904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

After the division, we end up with 35349.61904761 and a remainder of 1.9e-08.