260217 ÷ 21 
We want to figure out the number of times 260217 can be divided by 21.

Let's proceed to step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 21

Going ahead to step 2:
21 can be fit into 26 1 times, resulting in a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 21 from 26 leaves us with 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 21

Moving on to step 3:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we take 42 away from 50, we end up with 8.
Include the next digit (2) from the dividend after 8, then repeat: 82 / 21

Advancing to step 4:
If we divide 82 by 21, we get 3 and a remainder of 19.
The next digit of our result is 3. 
Result so far: 123.0
Subtracting 63 from 82 leaves us with 19.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 21

Moving on to step 5:
191 divided by 21 is 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 1239.0
Deduct 189 from 191 and we're left with 2.
Append the next digit (7) from the dividend to 2 and continue with: 27 / 21

Let's proceed to step 6:
If we divide 27 by 21, we get 1 and a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 12391.0
Subtracting 21 from 27 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.

Moving on to step 7:
If we divide 60 by 21, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 12391.2
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.

Let's proceed to step 8:
When dividing 180 by 21, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 12391.28
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.

Going ahead to step 9:
120 divided by 21 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 12391.285
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.

Let's proceed to step 10:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 12391.2857
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.

Step 11:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 12391.28571
Subtracting 21 from 30 leaves us 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 12:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 12391.285714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
When dividing 60 by 21, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 12391.2857142
If we take 42 away from 60, we end up 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 14:
180 divided by 21 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 12391.28571428
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.

In conclusion, the division gives 12391.28571428 with a balance of 1.2e-08.