We divide 225739 by 21
We want to figure out the number of times 225739 can be divided by 21.

Step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 21

Advancing to step 2:
21 can be fit into 22 1 times, resulting in a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 22 to get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 21

Advancing to step 3:
If we divide 15 by 21, we get 0 and a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 15 and we're left with 15.
Grab the next digit (7) from the dividend, add it to 15, then carry on: 157 / 21

Step 4:
If we divide 157 by 21, we get 7 and a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 107.0
Deduct 147 from 157 and we're left with 10.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 21

Let's proceed to step 5:
The number 21 fits into 103 4 times, leaving a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 1074.0
The remainder is 19 after subtracting 84 from 103.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 21

Let's proceed to step 6:
When dividing 199 by 21, we get 9 with a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 10749.0
Subtracting 189 from 199 leaves us 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.

Moving on to step 7:
If we divide 100 by 21, we get 4 and a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 10749.4
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 8:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 10749.47
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 9:
21 goes into 130 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 10749.476
The remainder is 4 after subtracting 126 from 130.
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 10:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 10749.4761
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.

Advancing to step 11:
When dividing 190 by 21, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 10749.47619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 12:
When dividing 10 by 21, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 10749.47619
Deduct 0 from 10 and we're left 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 13:
21 goes into 100 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 10749.4761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 14:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 10749.47619047
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.

The final outcome is 10749.47619047, with a leftover of 1.3e-08.