91180453 ÷ 438 
We want to figure out the number of times 91180453 can be divided by 438.

Going ahead to step 1:
438 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 438

Moving on to step 2:
If we divide 91 by 438, we get 0 and a remainder of 91.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Include the next digit (1) from the dividend after 91, then repeat: 911 / 438

On to step 3:
If we divide 911 by 438, we get 2 and a remainder of 35.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 876 from 911 leaves us with 35.
Take the next digit (8) from the dividend and append it to 35, then repeat: 358 / 438

Step 4:
438 goes into 358 0 times with a remainder of 358.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Subtracting 0 from 358 leaves us with 358.
Append the next digit (0) from the dividend to 358 and continue with: 3580 / 438

On to step 5:
The number 438 fits into 3580 8 times, leaving a remainder of 76.
Put 8 as the next digit of the answer. 
Result so far: 208.0
Subtract 3504 from 3580 to get 76.
Take the next digit (4) from the dividend and append it to 76, then repeat: 764 / 438

On to step 6:
The number 438 fits into 764 1 times, leaving a remainder of 326.
The next digit of our result is 1. 
Result so far: 2081.0
Subtract 438 from 764 to get 326.
Append the next digit (5) from the dividend to 326 and continue with: 3265 / 438

On to step 7:
438 can be fit into 3265 7 times, resulting in a remainder of 199.
Use 7 as the next digit of our solution. 
Result so far: 20817.0
If we take 3066 away from 3265, we end up with 199.
Take the next digit (3) from the dividend and append it to 199, then repeat: 1993 / 438

Going ahead to step 8:
When dividing 1993 by 438, we get 4 with a remainder of 241.
Use 4 as the next digit of our solution. 
Result so far: 208174.0
Deduct 1752 from 1993 and we're left with 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Step 9:
438 can be fit into 2410 5 times, resulting in a remainder of 220.
Write down 5 as next digit of the result. 
Result so far: 208174.5
If we take 2190 away from 2410, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 10:
2200 divided by 438 is 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 208174.55
If we subtract 2190 from 2200, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 208174.55 with a remaining 0.01.