We look at the division of 740430 by 21 
We're looking to find how many times 21 goes into 740430.

Advancing 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
If we subtract 0 from 7, we get 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 21

Step 2:
If we divide 74 by 21, we get 3 and 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.
Take the next digit (0) from the dividend and append it to 11, then repeat: 110 / 21

Advancing to step 3:
When dividing 110 by 21, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Deduct 105 from 110 and we're left with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 21

Advancing to step 4:
21 can be fit into 54 2 times, resulting in a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 352.0
Subtracting 42 from 54 leaves us with 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 21

Moving on to step 5:
If we divide 123 by 21, we get 5 and a remainder of 18.
The next digit of our result is 5. 
Result so far: 3525.0
Subtracting 105 from 123 leaves us with 18.
Include the next digit (0) from the dividend after 18, then repeat: 180 / 21

On to step 6:
21 goes into 180 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 35258.0
If we subtract 168 from 180, we 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.

Going ahead to step 7:
When dividing 120 by 21, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 35258.5
If we take 105 away from 120, we end up 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.

Let's proceed to step 8:
21 goes into 150 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 35258.57
Deduct 147 from 150 and we're left with 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 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 35258.571
Subtract 21 from 30 to 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.

Step 10:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 35258.5714
Deduct 84 from 90 and we're left 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.

Let's proceed to step 11:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 35258.57142
Subtract 42 from 60 to 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.

Advancing to step 12:
When dividing 180 by 21, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 35258.571428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 13:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 35258.5714285
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.

Moving on to step 14:
150 divided by 21 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 35258.57142857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 35258.57142857, with a leftover of 3e-09.