Let's divide 987665 by 21
We're looking to find how many times 21 goes into 987665.

Advancing to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 21

Moving on to step 2:
When dividing 98 by 21, we get 4 with a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 14 after subtracting 84 from 98.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 21

On to step 3:
If we divide 147 by 21, we get 7 and a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtracting 147 from 147 leaves us with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 21

On to step 4:
21 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 470.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 21

Advancing to step 5:
66 divided by 21 is 3 with a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 4703.0
Subtract 63 from 66 to get 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 21

Step 6:
21 can be fit into 35 1 times, resulting in a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 47031.0
Deduct 21 from 35 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
When dividing 140 by 21, we get 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 47031.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 8:
21 can be fit into 140 6 times, resulting in a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 47031.66
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 47031.66, with a leftover of 0.014.