We look at the division of 921099 by 3 
We're looking to find how many times 3 goes into 921099.

On to step 1:
The number 3 fits into 9 3 times, leaving a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 9 from 9 leaves us with 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 3

Step 2:
3 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 30.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

Advancing to step 3:
The number 3 fits into 21 7 times, leaving a remainder of 0.
The next digit of our result is 7. 
Result so far: 307.0
Subtracting 21 from 21 leaves us with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 3

On to step 4:
When dividing 0 by 3, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3070.0
Subtracting 0 from 0 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

Advancing to step 5:
The number 3 fits into 9 3 times, leaving a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 30703.0
If we take 9 away from 9, we end up with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 3

Advancing to step 6:
3 goes into 9 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 307033.0
Deduct 9 from 9 and we're left 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.

Advancing to step 7:
When dividing 0 by 3, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 307033.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
When dividing 0 by 3, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 307033.0
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.

Our division results in 307033.0 with a remaining 0.0.