99698051 ÷ 646 
Our goal is to divide 99698051 by 646.

Advancing to step 1:
9 divided by 646 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 646

Step 2:
The number 646 fits into 99 0 times, leaving a remainder of 99.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Bring next digit (6) of the dividend behind the 99 and repeat the process: 996 / 646

Advancing to step 3:
The number 646 fits into 996 1 times, leaving a remainder of 350.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 646 from 996 and we're left with 350.
Take the next digit (9) from the dividend and append it to 350, then repeat: 3509 / 646

Going ahead to step 4:
When dividing 3509 by 646, we get 5 with a remainder of 279.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtract 3230 from 3509 to get 279.
Take the next digit (8) from the dividend and append it to 279, then repeat: 2798 / 646

Let's proceed to step 5:
The number 646 fits into 2798 4 times, leaving a remainder of 214.
Use 4 as the next digit of our solution. 
Result so far: 154.0
The remainder is 214 after subtracting 2584 from 2798.
Take the next digit (0) from the dividend and append it to 214, then repeat: 2140 / 646

Moving on to step 6:
If we divide 2140 by 646, we get 3 and a remainder of 202.
Use 3 as the next digit of our solution. 
Result so far: 1543.0
If we subtract 1938 from 2140, we get 202.
Append the next digit (5) from the dividend to 202 and continue with: 2025 / 646

Moving on to step 7:
2025 divided by 646 is 3 with a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 15433.0
The remainder is 87 after subtracting 1938 from 2025.
Grab the next digit (1) from the dividend, add it to 87, then carry on: 871 / 646

On to step 8:
646 can be fit into 871 1 times, resulting in a remainder of 225.
The number 1 becomes the next digit in our result. 
Result so far: 154331.0
If we take 646 away from 871, we end up with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

On to step 9:
646 can be fit into 2250 3 times, resulting in a remainder of 312.
Write down 3 as next digit of the result. 
Result so far: 154331.3
Subtract 1938 from 2250 to get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Moving on to step 10:
The number 646 fits into 3120 4 times, leaving a remainder of 536.
The next digit of our result is 4. 
Result so far: 154331.34
If we subtract 2584 from 3120, we get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Going ahead to step 11:
The number 646 fits into 5360 8 times, leaving a remainder of 192.
Record the quotient 8 as the next digit in the result. 
Result so far: 154331.348
The remainder is 192 after subtracting 5168 from 5360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 12:
If we divide 1920 by 646, we get 2 and a remainder of 628.
Write down 2 as next digit of the result. 
Result so far: 154331.3482
The remainder is 628 after subtracting 1292 from 1920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 13:
646 can be fit into 6280 9 times, resulting in a remainder of 466.
Record the quotient 9 as the next digit in the result. 
Result so far: 154331.34829
Subtract 5814 from 6280 to get 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

On to step 14:
646 can be fit into 4660 7 times, resulting in a remainder of 138.
Record the quotient 7 as the next digit in the result. 
Result so far: 154331.348297
If we subtract 4522 from 4660, we get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Step 15:
1380 divided by 646 is 2 with a remainder of 88.
Put 2 as the next digit of the answer. 
Result so far: 154331.3482972
If we take 1292 away from 1380, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 16:
The number 646 fits into 880 1 times, leaving a remainder of 234.
Record the quotient 1 as the next digit in the result. 
Result so far: 154331.34829721
Subtract 646 from 880 to get 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

The final outcome is 154331.34829721, with a leftover of 2.34e-07.