83971287 ÷ 964 
We want to figure out the number of times 83971287 can be divided by 964.

Step 1:
8 divided by 964 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 964

Moving on to step 2:
83 divided by 964 is 0 with a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Include the next digit (9) from the dividend after 83, then repeat: 839 / 964

Advancing to step 3:
839 divided by 964 is 0 with a remainder of 839.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 839, we get 839.
Fetch the next digit (7) from the dividend, attach it to 839 and continue: 8397 / 964

Advancing to step 4:
If we divide 8397 by 964, we get 8 and a remainder of 685.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 7712 away from 8397, we end up with 685.
Bring next digit (1) of the dividend behind the 685 and repeat the process: 6851 / 964

Advancing to step 5:
The number 964 fits into 6851 7 times, leaving a remainder of 103.
Record the quotient 7 as the next digit in the result. 
Result so far: 87.0
The remainder is 103 after subtracting 6748 from 6851.
Fetch the next digit (2) from the dividend, attach it to 103 and continue: 1032 / 964

Moving on to step 6:
When dividing 1032 by 964, we get 1 with a remainder of 68.
The next digit of our result is 1. 
Result so far: 871.0
If we subtract 964 from 1032, we get 68.
Fetch the next digit (8) from the dividend, attach it to 68 and continue: 688 / 964

Let's proceed to step 7:
If we divide 688 by 964, we get 0 and a remainder of 688.
The next digit of our result is 0. 
Result so far: 8710.0
Deduct 0 from 688 and we're left with 688.
Fetch the next digit (7) from the dividend, attach it to 688 and continue: 6887 / 964

Advancing to step 8:
964 goes into 6887 7 times with a remainder of 139.
Use 7 as the next digit of our solution. 
Result so far: 87107.0
Subtract 6748 from 6887 to get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

On to step 9:
If we divide 1390 by 964, we get 1 and a remainder of 426.
The number 1 becomes the next digit in our result. 
Result so far: 87107.1
Subtracting 964 from 1390 leaves us with 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

Advancing to step 10:
4260 divided by 964 is 4 with a remainder of 404.
The next digit of our result is 4. 
Result so far: 87107.14
If we subtract 3856 from 4260, we get 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Step 11:
964 goes into 4040 4 times with a remainder of 184.
Record the quotient 4 as the next digit in the result. 
Result so far: 87107.144
Subtracting 3856 from 4040 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

After the division, we end up with 87107.144 and a remainder of 0.0184.