We divide 31912172 by 391
We want to figure out the number of times 31912172 can be divided by 391.

Step 1:
The number 391 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 391

Step 2:
When dividing 31 by 391, we get 0 with a remainder of 31.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Fetch the next digit (9) from the dividend, attach it to 31 and continue: 319 / 391

Let's proceed to step 3:
The number 391 fits into 319 0 times, leaving a remainder of 319.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 319, we get 319.
Grab the next digit (1) from the dividend, add it to 319, then carry on: 3191 / 391

Advancing to step 4:
When dividing 3191 by 391, we get 8 with a remainder of 63.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 3128 away from 3191, we end up with 63.
Append the next digit (2) from the dividend to 63 and continue with: 632 / 391

Going ahead to step 5:
391 goes into 632 1 times with a remainder of 241.
The number 1 becomes the next digit in our result. 
Result so far: 81.0
The remainder is 241 after subtracting 391 from 632.
Append the next digit (1) from the dividend to 241 and continue with: 2411 / 391

Going ahead to step 6:
391 goes into 2411 6 times with a remainder of 65.
Record the quotient 6 as the next digit in the result. 
Result so far: 816.0
Subtracting 2346 from 2411 leaves us with 65.
Take the next digit (7) from the dividend and append it to 65, then repeat: 657 / 391

Moving on to step 7:
The number 391 fits into 657 1 times, leaving a remainder of 266.
The number 1 becomes the next digit in our result. 
Result so far: 8161.0
Deduct 391 from 657 and we're left with 266.
Append the next digit (2) from the dividend to 266 and continue with: 2662 / 391

Going ahead to step 8:
391 goes into 2662 6 times with a remainder of 316.
The number 6 becomes the next digit in our result. 
Result so far: 81616.0
If we subtract 2346 from 2662, we get 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 9:
If we divide 3160 by 391, we get 8 and a remainder of 32.
The next digit of our result is 8. 
Result so far: 81616.8
The remainder is 32 after subtracting 3128 from 3160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 10:
If we divide 320 by 391, we get 0 and a remainder of 320.
The number 0 becomes the next digit in our result. 
Result so far: 81616.8
If we take 0 away from 320, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 11:
391 can be fit into 3200 8 times, resulting in a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 81616.808
If we take 3128 away from 3200, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 12:
If we divide 720 by 391, we get 1 and a remainder of 329.
The next digit of our result is 1. 
Result so far: 81616.8081
Subtract 391 from 720 to get 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Advancing to step 13:
391 goes into 3290 8 times with a remainder of 162.
The number 8 becomes the next digit in our result. 
Result so far: 81616.80818
Subtract 3128 from 3290 to get 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Step 14:
The number 391 fits into 1620 4 times, leaving a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 81616.808184
Subtract 1564 from 1620 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 15:
391 can be fit into 560 1 times, resulting in a remainder of 169.
The next digit of our result is 1. 
Result so far: 81616.8081841
The remainder is 169 after subtracting 391 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

On to step 16:
1690 divided by 391 is 4 with a remainder of 126.
Write down 4 as next digit of the result. 
Result so far: 81616.80818414
Subtracting 1564 from 1690 leaves us with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

After the division, we end up with 81616.80818414 and a remainder of 1.26e-07.