639986 ÷ 87 
The aim is to understand the frequency of 87 in 639986.

Advancing to step 1:
87 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 87

Advancing to step 2:
87 goes into 63 0 times with a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 87

Going ahead to step 3:
If we divide 639 by 87, we get 7 and a remainder of 30.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 609 from 639, we get 30.
Fetch the next digit (9) from the dividend, attach it to 30 and continue: 309 / 87

Advancing to step 4:
87 goes into 309 3 times with a remainder of 48.
Write down 3 as next digit of the result. 
Result so far: 73.0
If we subtract 261 from 309, we get 48.
Include the next digit (8) from the dividend after 48, then repeat: 488 / 87

Advancing to step 5:
If we divide 488 by 87, we get 5 and a remainder of 53.
Record the quotient 5 as the next digit in the result. 
Result so far: 735.0
Deduct 435 from 488 and we're left with 53.
Fetch the next digit (6) from the dividend, attach it to 53 and continue: 536 / 87

Going ahead to step 6:
536 divided by 87 is 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 7356.0
Subtracting 522 from 536 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
87 goes into 140 1 times with a remainder of 53.
Record the quotient 1 as the next digit in the result. 
Result so far: 7356.1
The remainder is 53 after subtracting 87 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

On to step 8:
The number 87 fits into 530 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 7356.16
If we take 522 away from 530, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
87 can be fit into 80 0 times, resulting in a remainder of 80.
The next digit of our result is 0. 
Result so far: 7356.16
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 10:
If we divide 800 by 87, we get 9 and a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 7356.1609
The remainder is 17 after subtracting 783 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
87 goes into 170 1 times with a remainder of 83.
Record the quotient 1 as the next digit in the result. 
Result so far: 7356.16091
Subtract 87 from 170 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 12:
87 goes into 830 9 times with a remainder of 47.
Record the quotient 9 as the next digit in the result. 
Result so far: 7356.160919
Subtract 783 from 830 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 13:
87 goes into 470 5 times with a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 7356.1609195
If we subtract 435 from 470, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
350 divided by 87 is 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 7356.16091954
Subtract 348 from 350 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 7356.16091954 with a remaining 2e-09.