5255417 ÷ 21 
We want to divide 5255417 by 21.

Going ahead to step 1:
21 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 21

Going ahead to step 2:
21 goes into 52 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 42 from 52 leaves us with 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 21

Going ahead to step 3:
105 divided by 21 is 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtracting 105 from 105 leaves us with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 21

Step 4:
21 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 250.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 21

Moving on to step 5:
When dividing 54 by 21, we get 2 with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 2502.0
Deduct 42 from 54 and we're left with 12.
Fetch the next digit (1) from the dividend, attach it to 12 and continue: 121 / 21

On to step 6:
121 divided by 21 is 5 with a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 25025.0
Deduct 105 from 121 and we're left with 16.
Include the next digit (7) from the dividend after 16, then repeat: 167 / 21

Advancing to step 7:
The number 21 fits into 167 7 times, leaving a remainder of 20.
The next digit of our result is 7. 
Result so far: 250257.0
Subtracting 147 from 167 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
If we divide 200 by 21, we get 9 and a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 250257.9
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
When dividing 110 by 21, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 250257.95
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 10:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 250257.952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 250257.9523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 250257.95238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
When dividing 20 by 21, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 250257.95238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 250257.9523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 15:
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: 250257.95238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

In conclusion, the division gives 250257.95238095 with a balance of 5e-09.