99136402 ÷ 646 
Let's see how many times 646 fits into 99136402.

Moving on to step 1:
The number 646 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 646

Moving on to step 2:
If we divide 99 by 646, we get 0 and a remainder of 99.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 99, we end up with 99.
Append the next digit (1) from the dividend to 99 and continue with: 991 / 646

Advancing to step 3:
The number 646 fits into 991 1 times, leaving a remainder of 345.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 646 from 991, we get 345.
Fetch the next digit (3) from the dividend, attach it to 345 and continue: 3453 / 646

Advancing to step 4:
646 can be fit into 3453 5 times, resulting in a remainder of 223.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtracting 3230 from 3453 leaves us with 223.
Append the next digit (6) from the dividend to 223 and continue with: 2236 / 646

On to step 5:
646 can be fit into 2236 3 times, resulting in a remainder of 298.
Put 3 as the next digit of the answer. 
Result so far: 153.0
If we subtract 1938 from 2236, we get 298.
Append the next digit (4) from the dividend to 298 and continue with: 2984 / 646

Let's proceed to step 6:
2984 divided by 646 is 4 with a remainder of 400.
The number 4 becomes the next digit in our result. 
Result so far: 1534.0
Deduct 2584 from 2984 and we're left with 400.
Take the next digit (0) from the dividend and append it to 400, then repeat: 4000 / 646

Going ahead to step 7:
The number 646 fits into 4000 6 times, leaving a remainder of 124.
Write down 6 as next digit of the result. 
Result so far: 15346.0
Subtract 3876 from 4000 to get 124.
Grab the next digit (2) from the dividend, add it to 124, then carry on: 1242 / 646

On to step 8:
1242 divided by 646 is 1 with a remainder of 596.
The number 1 becomes the next digit in our result. 
Result so far: 153461.0
Subtract 646 from 1242 to get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Step 9:
When dividing 5960 by 646, we get 9 with a remainder of 146.
Put 9 as the next digit of the answer. 
Result so far: 153461.9
If we subtract 5814 from 5960, we get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Going ahead to step 10:
If we divide 1460 by 646, we get 2 and a remainder of 168.
Record the quotient 2 as the next digit in the result. 
Result so far: 153461.92
Deduct 1292 from 1460 and we're left with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Step 11:
1680 divided by 646 is 2 with a remainder of 388.
The next digit of our result is 2. 
Result so far: 153461.922
Deduct 1292 from 1680 and we're left with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

The quotient of the division is 153461.922, and the remainder is 0.0388.