91665110 ÷ 138 
We want to divide 91665110 by 138.

On to step 1:
9 divided by 138 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 138

Let's proceed to step 2:
91 divided by 138 is 0 with a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Take the next digit (6) from the dividend and append it to 91, then repeat: 916 / 138

Going ahead to step 3:
The number 138 fits into 916 6 times, leaving a remainder of 88.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we subtract 828 from 916, we get 88.
Append the next digit (6) from the dividend to 88 and continue with: 886 / 138

Going ahead to step 4:
If we divide 886 by 138, we get 6 and a remainder of 58.
The number 6 becomes the next digit in our result. 
Result so far: 66.0
Subtract 828 from 886 to get 58.
Bring next digit (5) of the dividend behind the 58 and repeat the process: 585 / 138

On to step 5:
138 can be fit into 585 4 times, resulting in a remainder of 33.
The next digit of our result is 4. 
Result so far: 664.0
If we subtract 552 from 585, we get 33.
Take the next digit (1) from the dividend and append it to 33, then repeat: 331 / 138

Advancing to step 6:
138 can be fit into 331 2 times, resulting in a remainder of 55.
Record the quotient 2 as the next digit in the result. 
Result so far: 6642.0
The remainder is 55 after subtracting 276 from 331.
Bring next digit (1) of the dividend behind the 55 and repeat the process: 551 / 138

On to step 7:
138 can be fit into 551 3 times, resulting in a remainder of 137.
Put 3 as the next digit of the answer. 
Result so far: 66423.0
If we take 414 away from 551, we end up with 137.
Append the next digit (0) from the dividend to 137 and continue with: 1370 / 138

Moving on to step 8:
138 goes into 1370 9 times with a remainder of 128.
The number 9 becomes the next digit in our result. 
Result so far: 664239.0
If we subtract 1242 from 1370, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

On to step 9:
138 can be fit into 1280 9 times, resulting in a remainder of 38.
The next digit of our result is 9. 
Result so far: 664239.9
Subtract 1242 from 1280 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
If we divide 380 by 138, we get 2 and a remainder of 104.
Record the quotient 2 as the next digit in the result. 
Result so far: 664239.92
Deduct 276 from 380 and we're left with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Moving on to step 11:
138 can be fit into 1040 7 times, resulting in a remainder of 74.
Put 7 as the next digit of the answer. 
Result so far: 664239.927
The remainder is 74 after subtracting 966 from 1040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 12:
When dividing 740 by 138, we get 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 664239.9275
The remainder is 50 after subtracting 690 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 13:
The number 138 fits into 500 3 times, leaving a remainder of 86.
Use 3 as the next digit of our solution. 
Result so far: 664239.92753
If we subtract 414 from 500, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 14:
138 can be fit into 860 6 times, resulting in a remainder of 32.
Write down 6 as next digit of the result. 
Result so far: 664239.927536
Subtract 828 from 860 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 15:
If we divide 320 by 138, we get 2 and a remainder of 44.
Record the quotient 2 as the next digit in the result. 
Result so far: 664239.9275362
Subtract 276 from 320 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 16:
138 goes into 440 3 times with a remainder of 26.
The next digit of our result is 3. 
Result so far: 664239.92753623
If we subtract 414 from 440, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final outcome is 664239.92753623, with a leftover of 2.6e-08.