99439766 ÷ 170 
Our goal is to divide 99439766 by 170.

Moving on to step 1:
The number 170 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 170

Let's proceed to step 2:
170 goes into 99 0 times with a remainder of 99.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Include the next digit (4) from the dividend after 99, then repeat: 994 / 170

Let's proceed to step 3:
If we divide 994 by 170, we get 5 and a remainder of 144.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 850 from 994, we get 144.
Take the next digit (3) from the dividend and append it to 144, then repeat: 1443 / 170

On to step 4:
If we divide 1443 by 170, we get 8 and a remainder of 83.
The number 8 becomes the next digit in our result. 
Result so far: 58.0
Deduct 1360 from 1443 and we're left with 83.
Append the next digit (9) from the dividend to 83 and continue with: 839 / 170

Going ahead to step 5:
If we divide 839 by 170, we get 4 and a remainder of 159.
Use 4 as the next digit of our solution. 
Result so far: 584.0
If we take 680 away from 839, we end up with 159.
Fetch the next digit (7) from the dividend, attach it to 159 and continue: 1597 / 170

Advancing to step 6:
If we divide 1597 by 170, we get 9 and a remainder of 67.
Record the quotient 9 as the next digit in the result. 
Result so far: 5849.0
Deduct 1530 from 1597 and we're left with 67.
Grab the next digit (6) from the dividend, add it to 67, then carry on: 676 / 170

Moving on to step 7:
When dividing 676 by 170, we get 3 with a remainder of 166.
Put 3 as the next digit of the answer. 
Result so far: 58493.0
Subtracting 510 from 676 leaves us with 166.
Take the next digit (6) from the dividend and append it to 166, then repeat: 1666 / 170

Moving on to step 8:
170 goes into 1666 9 times with a remainder of 136.
The next digit of our result is 9. 
Result so far: 584939.0
Deduct 1530 from 1666 and we're left with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Advancing to step 9:
170 goes into 1360 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 584939.8
Subtracting 1360 from 1360 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.

Step 10:
When dividing 0 by 170, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 584939.8
If we subtract 0 from 0, we 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.

Going ahead to step 11:
When dividing 0 by 170, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 584939.8
If we subtract 0 from 0, we 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.

Our division results in 584939.8 with a remaining 0.0.