989478 ÷ 21 
Our goal is to divide 989478 by 21.

Moving on to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 21

Step 2:
If we divide 98 by 21, we get 4 and a remainder of 14.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 84 from 98 and we're left with 14.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 21

Advancing to step 3:
The number 21 fits into 149 7 times, leaving a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 47.0
Deduct 147 from 149 and we're left with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 21

Moving on to step 4:
24 divided by 21 is 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 471.0
Deduct 21 from 24 and we're left with 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 21

Moving on to step 5:
37 divided by 21 is 1 with a remainder of 16.
Write down 1 as next digit of the result. 
Result so far: 4711.0
Deduct 21 from 37 and we're left with 16.
Include the next digit (8) from the dividend after 16, then repeat: 168 / 21

Step 6:
21 can be fit into 168 8 times, resulting in a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 47118.0
The remainder is 0 after subtracting 168 from 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
0 divided by 21 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 47118.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
0 divided by 21 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 47118.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 47118.0 and a remainder of 0.0.