91870373 ÷ 631 
We want to figure out the number of times 91870373 can be divided by 631.

Advancing to step 1:
631 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 631

Going ahead to step 2:
When dividing 91 by 631, we get 0 with a remainder of 91.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 91 and we're left with 91.
Append the next digit (8) from the dividend to 91 and continue with: 918 / 631

Advancing to step 3:
918 divided by 631 is 1 with a remainder of 287.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 631 from 918 to get 287.
Bring next digit (7) of the dividend behind the 287 and repeat the process: 2877 / 631

Step 4:
631 can be fit into 2877 4 times, resulting in a remainder of 353.
Put 4 as the next digit of the answer. 
Result so far: 14.0
Deduct 2524 from 2877 and we're left with 353.
Fetch the next digit (0) from the dividend, attach it to 353 and continue: 3530 / 631

On to step 5:
If we divide 3530 by 631, we get 5 and a remainder of 375.
Record the quotient 5 as the next digit in the result. 
Result so far: 145.0
The remainder is 375 after subtracting 3155 from 3530.
Include the next digit (3) from the dividend after 375, then repeat: 3753 / 631

Advancing to step 6:
If we divide 3753 by 631, we get 5 and a remainder of 598.
The number 5 becomes the next digit in our result. 
Result so far: 1455.0
If we subtract 3155 from 3753, we get 598.
Bring next digit (7) of the dividend behind the 598 and repeat the process: 5987 / 631

On to step 7:
631 can be fit into 5987 9 times, resulting in a remainder of 308.
Put 9 as the next digit of the answer. 
Result so far: 14559.0
If we subtract 5679 from 5987, we get 308.
Grab the next digit (3) from the dividend, add it to 308, then carry on: 3083 / 631

On to step 8:
When dividing 3083 by 631, we get 4 with a remainder of 559.
The next digit of our result is 4. 
Result so far: 145594.0
If we subtract 2524 from 3083, we get 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

On to step 9:
The number 631 fits into 5590 8 times, leaving a remainder of 542.
Put 8 as the next digit of the answer. 
Result so far: 145594.8
The remainder is 542 after subtracting 5048 from 5590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

Advancing to step 10:
If we divide 5420 by 631, we get 8 and a remainder of 372.
Use 8 as the next digit of our solution. 
Result so far: 145594.88
If we subtract 5048 from 5420, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

The quotient of the division is 145594.88, and the remainder is 0.372.