99638139 ÷ 170 
We're looking to find how many times 170 goes into 99638139.

On to step 1:
9 divided by 170 is 0 with 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.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 170

Let's proceed to step 2:
170 goes into 99 0 times with a remainder of 99.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 99 and we're left with 99.
Grab the next digit (6) from the dividend, add it to 99, then carry on: 996 / 170

Let's proceed to step 3:
When dividing 996 by 170, we get 5 with a remainder of 146.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 850 from 996, we get 146.
Include the next digit (3) from the dividend after 146, then repeat: 1463 / 170

Step 4:
170 can be fit into 1463 8 times, resulting in a remainder of 103.
Record the quotient 8 as the next digit in the result. 
Result so far: 58.0
The remainder is 103 after subtracting 1360 from 1463.
Append the next digit (8) from the dividend to 103 and continue with: 1038 / 170

Advancing to step 5:
If we divide 1038 by 170, we get 6 and a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 586.0
Subtracting 1020 from 1038 leaves us with 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 170

Moving on to step 6:
If we divide 181 by 170, we get 1 and a remainder of 11.
The next digit of our result is 1. 
Result so far: 5861.0
If we take 170 away from 181, we end up with 11.
Fetch the next digit (3) from the dividend, attach it to 11 and continue: 113 / 170

Going ahead to step 7:
170 can be fit into 113 0 times, resulting in a remainder of 113.
Use 0 as the next digit of our solution. 
Result so far: 58610.0
If we subtract 0 from 113, we get 113.
Include the next digit (9) from the dividend after 113, then repeat: 1139 / 170

Let's proceed to step 8:
When dividing 1139 by 170, we get 6 with a remainder of 119.
Use 6 as the next digit of our solution. 
Result so far: 586106.0
Subtracting 1020 from 1139 leaves us with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 9:
170 can be fit into 1190 7 times, resulting in a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 586106.7
If we take 1190 away from 1190, 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.

Step 10:
170 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 586106.7
Deduct 0 from 0 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.

Step 11:
When dividing 0 by 170, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 586106.7
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.

Our division results in 586106.7 with a remaining 0.0.