210031 ÷ 87 
The aim is to understand the frequency of 87 in 210031.

On to step 1:
If we divide 2 by 87, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 87

Advancing to step 2:
87 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 87

Advancing to step 3:
87 goes into 210 2 times with a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 174 from 210 to get 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 87

Going ahead to step 4:
When dividing 360 by 87, we get 4 with a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
The remainder is 12 after subtracting 348 from 360.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 87

On to step 5:
If we divide 123 by 87, we get 1 and a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 241.0
The remainder is 36 after subtracting 87 from 123.
Append the next digit (1) from the dividend to 36 and continue with: 361 / 87

Advancing to step 6:
When dividing 361 by 87, we get 4 with a remainder of 13.
Use 4 as the next digit of our solution. 
Result so far: 2414.0
If we subtract 348 from 361, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 7:
87 can be fit into 130 1 times, resulting in a remainder of 43.
The next digit of our result is 1. 
Result so far: 2414.1
Deduct 87 from 130 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 8:
If we divide 430 by 87, we get 4 and a remainder of 82.
Use 4 as the next digit of our solution. 
Result so far: 2414.14
The remainder is 82 after subtracting 348 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 9:
87 goes into 820 9 times with a remainder of 37.
Write down 9 as next digit of the result. 
Result so far: 2414.149
If we subtract 783 from 820, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 10:
87 can be fit into 370 4 times, resulting in a remainder of 22.
Put 4 as the next digit of the answer. 
Result so far: 2414.1494
If we subtract 348 from 370, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 11:
The number 87 fits into 220 2 times, leaving a remainder of 46.
The next digit of our result is 2. 
Result so far: 2414.14942
If we take 174 away from 220, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 12:
87 can be fit into 460 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 2414.149425
If we subtract 435 from 460, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 13:
The number 87 fits into 250 2 times, leaving a remainder of 76.
The next digit of our result is 2. 
Result so far: 2414.1494252
Deduct 174 from 250 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 14:
When dividing 760 by 87, we get 8 with a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 2414.14942528
Subtracting 696 from 760 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

After the division, we end up with 2414.14942528 and a remainder of 6.4e-08.