Let's divide 43520163 by 991
We're looking to find how many times 991 goes into 43520163.

Advancing to step 1:
The number 991 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 991

Let's proceed to step 2:
43 divided by 991 is 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Include the next digit (5) from the dividend after 43, then repeat: 435 / 991

Going ahead to step 3:
When dividing 435 by 991, we get 0 with a remainder of 435.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 435, we get 435.
Fetch the next digit (2) from the dividend, attach it to 435 and continue: 4352 / 991

Advancing to step 4:
When dividing 4352 by 991, we get 4 with a remainder of 388.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 3964 from 4352 leaves us with 388.
Grab the next digit (0) from the dividend, add it to 388, then carry on: 3880 / 991

Advancing to step 5:
991 goes into 3880 3 times with a remainder of 907.
Use 3 as the next digit of our solution. 
Result so far: 43.0
Subtract 2973 from 3880 to get 907.
Append the next digit (1) from the dividend to 907 and continue with: 9071 / 991

On to step 6:
When dividing 9071 by 991, we get 9 with a remainder of 152.
The number 9 becomes the next digit in our result. 
Result so far: 439.0
Subtracting 8919 from 9071 leaves us with 152.
Bring next digit (6) of the dividend behind the 152 and repeat the process: 1526 / 991

Advancing to step 7:
991 can be fit into 1526 1 times, resulting in a remainder of 535.
The next digit of our result is 1. 
Result so far: 4391.0
Deduct 991 from 1526 and we're left with 535.
Fetch the next digit (3) from the dividend, attach it to 535 and continue: 5353 / 991

Advancing to step 8:
991 goes into 5353 5 times with a remainder of 398.
The next digit of our result is 5. 
Result so far: 43915.0
Subtracting 4955 from 5353 leaves us with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Going ahead to step 9:
If we divide 3980 by 991, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 43915.4
The remainder is 16 after subtracting 3964 from 3980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 10:
When dividing 160 by 991, we get 0 with a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 43915.4
Deduct 0 from 160 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 11:
If we divide 1600 by 991, we get 1 and a remainder of 609.
Put 1 as the next digit of the answer. 
Result so far: 43915.401
If we take 991 away from 1600, we end up with 609.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6090, and continue the process.

Moving on to step 12:
991 can be fit into 6090 6 times, resulting in a remainder of 144.
Use 6 as the next digit of our solution. 
Result so far: 43915.4016
If we take 5946 away from 6090, we end up with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 13:
If we divide 1440 by 991, we get 1 and a remainder of 449.
The next digit of our result is 1. 
Result so far: 43915.40161
Subtract 991 from 1440 to get 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

On to step 14:
991 goes into 4490 4 times with a remainder of 526.
Record the quotient 4 as the next digit in the result. 
Result so far: 43915.401614
Deduct 3964 from 4490 and we're left with 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

Advancing to step 15:
When dividing 5260 by 991, we get 5 with a remainder of 305.
Use 5 as the next digit of our solution. 
Result so far: 43915.4016145
The remainder is 305 after subtracting 4955 from 5260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Advancing to step 16:
991 goes into 3050 3 times with a remainder of 77.
Record the quotient 3 as the next digit in the result. 
Result so far: 43915.40161453
If we subtract 2973 from 3050, we get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Our division results in 43915.40161453 with a remaining 7.7e-08.