We're dividing 87121845 by 531 
Let's see how many times 531 fits into 87121845.

Step 1:
When dividing 8 by 531, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 531

Step 2:
When dividing 87 by 531, we get 0 with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Append the next digit (1) from the dividend to 87 and continue with: 871 / 531

On to step 3:
When dividing 871 by 531, we get 1 with a remainder of 340.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 531 from 871, we get 340.
Bring next digit (2) of the dividend behind the 340 and repeat the process: 3402 / 531

Advancing to step 4:
3402 divided by 531 is 6 with a remainder of 216.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtract 3186 from 3402 to get 216.
Bring next digit (1) of the dividend behind the 216 and repeat the process: 2161 / 531

Advancing to step 5:
The number 531 fits into 2161 4 times, leaving a remainder of 37.
Record the quotient 4 as the next digit in the result. 
Result so far: 164.0
If we take 2124 away from 2161, we end up with 37.
Grab the next digit (8) from the dividend, add it to 37, then carry on: 378 / 531

Step 6:
The number 531 fits into 378 0 times, leaving a remainder of 378.
Write down 0 as next digit of the result. 
Result so far: 1640.0
If we take 0 away from 378, we end up with 378.
Append the next digit (4) from the dividend to 378 and continue with: 3784 / 531

Moving on to step 7:
531 goes into 3784 7 times with a remainder of 67.
Record the quotient 7 as the next digit in the result. 
Result so far: 16407.0
Subtracting 3717 from 3784 leaves us with 67.
Fetch the next digit (5) from the dividend, attach it to 67 and continue: 675 / 531

Advancing to step 8:
531 can be fit into 675 1 times, resulting in a remainder of 144.
Put 1 as the next digit of the answer. 
Result so far: 164071.0
Subtracting 531 from 675 leaves us 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.

Let's proceed to step 9:
531 goes into 1440 2 times with a remainder of 378.
Write down 2 as next digit of the result. 
Result so far: 164071.2
The remainder is 378 after subtracting 1062 from 1440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Going ahead to step 10:
If we divide 3780 by 531, we get 7 and a remainder of 63.
The next digit of our result is 7. 
Result so far: 164071.27
Deduct 3717 from 3780 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 11:
When dividing 630 by 531, we get 1 with a remainder of 99.
Record the quotient 1 as the next digit in the result. 
Result so far: 164071.271
Subtract 531 from 630 to get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

On to step 12:
531 can be fit into 990 1 times, resulting in a remainder of 459.
Record the quotient 1 as the next digit in the result. 
Result so far: 164071.2711
Deduct 531 from 990 and we're left with 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4590, and continue the process.

Our division results in 164071.2711 with a remaining 0.00459.