We're dividing 25460958 by 21 
We want to divide 25460958 by 21.

Going ahead to step 1:
If we divide 2 by 21, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 21

Moving on to step 2:
25 divided by 21 is 1 with a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 21 from 25 leaves us with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 21

On to step 3:
When dividing 44 by 21, we get 2 with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 42 from 44 and we're left with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 21

Moving on to step 4:
The number 21 fits into 26 1 times, leaving a remainder of 5.
The next digit of our result is 1. 
Result so far: 121.0
If we subtract 21 from 26, we get 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 21

Moving on to step 5:
21 goes into 50 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 1212.0
If we subtract 42 from 50, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 21

Going ahead to step 6:
If we divide 89 by 21, we get 4 and a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 12124.0
If we subtract 84 from 89, we get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 21

Step 7:
55 divided by 21 is 2 with a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 121242.0
If we take 42 away from 55, we end up with 13.
Include the next digit (8) from the dividend after 13, then repeat: 138 / 21

Going ahead to step 8:
138 divided by 21 is 6 with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 1212426.0
Deduct 126 from 138 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 9:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 1212426.5
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.

Moving on to step 10:
When dividing 150 by 21, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 1212426.57
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 11:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1212426.571
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.

Step 12:
If we divide 90 by 21, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 1212426.5714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 1212426.57142
Subtracting 42 from 60 leaves us 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:
If we divide 180 by 21, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 1212426.571428
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.

Going ahead to step 15:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 1212426.5714285
The remainder is 15 after subtracting 105 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 16:
21 goes into 150 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 1212426.57142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

After the division, we end up with 1212426.57142857 and a remainder of 3e-09.