We look at the division of 902957 by 21 
Our goal is to divide 902957 by 21.

Moving on to step 1:
21 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 21

Step 2:
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: 4.0
Subtracting 84 from 90 leaves us with 6.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 21

Going ahead to step 3:
21 goes into 62 2 times with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 42.0
Subtract 42 from 62 to get 20.
Include the next digit (9) from the dividend after 20, then repeat: 209 / 21

Let's proceed to step 4:
If we divide 209 by 21, we get 9 and a remainder of 20.
The next digit of our result is 9. 
Result so far: 429.0
The remainder is 20 after subtracting 189 from 209.
Append the next digit (5) from the dividend to 20 and continue with: 205 / 21

Step 5:
21 goes into 205 9 times with a remainder of 16.
Write down 9 as next digit of the result. 
Result so far: 4299.0
The remainder is 16 after subtracting 189 from 205.
Include the next digit (7) from the dividend after 16, then repeat: 167 / 21

Step 6:
21 can be fit into 167 7 times, resulting in a remainder of 20.
Record the quotient 7 as the next digit in the result. 
Result so far: 42997.0
If we subtract 147 from 167, 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.

Step 7:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 42997.9
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.

Going ahead to step 8:
21 goes into 110 5 times with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 42997.95
Deduct 105 from 110 and we're left 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.

Moving on to step 9:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 42997.952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 42997.9523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 42997.95238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 42997.95238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
When dividing 200 by 21, we get 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 42997.9523809
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.

Advancing to step 14:
110 divided by 21 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 42997.95238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 42997.95238095 and a remainder of 5e-09.