718140 divided by 21 
We're looking to find how many times 21 goes into 718140.

Step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 21

Step 2:
21 can be fit into 71 3 times, resulting in a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 71, we end up with 8.
Include the next digit (8) from the dividend after 8, then repeat: 88 / 21

Let's proceed to step 3:
21 can be fit into 88 4 times, resulting in a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
The remainder is 4 after subtracting 84 from 88.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 21

Let's proceed to step 4:
If we divide 41 by 21, we get 1 and a remainder of 20.
The next digit of our result is 1. 
Result so far: 341.0
Subtract 21 from 41 to get 20.
Fetch the next digit (4) from the dividend, attach it to 20 and continue: 204 / 21

Step 5:
204 divided by 21 is 9 with a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 3419.0
Deduct 189 from 204 and we're left with 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 21

Moving on to step 6:
If we divide 150 by 21, we get 7 and a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 34197.0
If we take 147 away from 150, we end up 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.

On to step 7:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 34197.1
If we take 21 away from 30, we end up with 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 8:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 34197.14
If we take 84 away from 90, we end up 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.

On to step 9:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 34197.142
If we subtract 42 from 60, 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.

Step 10:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 34197.1428
The remainder is 12 after subtracting 168 from 180.
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 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 34197.14285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 12:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 34197.142857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 34197.1428571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 14:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 34197.14285714
If we take 84 away from 90, we end up 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.

After the division, we end up with 34197.14285714 and a remainder of 6e-09.