86215 divided by 51 
The aim is to understand the frequency of 51 in 86215.

Step 1:
The number 51 fits into 8 0 times, leaving 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 (6) of the dividend behind the 8 and repeat the process: 86 / 51

Advancing to step 2:
51 goes into 86 1 times with a remainder of 35.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 51 from 86 and we're left with 35.
Fetch the next digit (2) from the dividend, attach it to 35 and continue: 352 / 51

Step 3:
51 can be fit into 352 6 times, resulting in a remainder of 46.
Write down 6 as next digit of the result. 
Result so far: 16.0
The remainder is 46 after subtracting 306 from 352.
Include the next digit (1) from the dividend after 46, then repeat: 461 / 51

Going ahead to step 4:
When dividing 461 by 51, we get 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 169.0
If we subtract 459 from 461, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 51

Let's proceed to step 5:
If we divide 25 by 51, we get 0 and a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 1690.0
Deduct 0 from 25 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 6:
250 divided by 51 is 4 with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 1690.4
Deduct 204 from 250 and we're left 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.

Let's proceed to step 7:
The number 51 fits into 460 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 1690.49
Subtracting 459 from 460 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 8:
The number 51 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 1690.49
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
100 divided by 51 is 1 with a remainder of 49.
The next digit of our result is 1. 
Result so far: 1690.4901
If we take 51 away from 100, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 10:
490 divided by 51 is 9 with a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 1690.49019
The remainder is 31 after subtracting 459 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 11:
310 divided by 51 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 1690.490196
The remainder is 4 after subtracting 306 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
The number 51 fits into 40 0 times, leaving a remainder of 40.
The next digit of our result is 0. 
Result so far: 1690.490196
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 13:
51 goes into 400 7 times with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 1690.49019607
Subtracting 357 from 400 leaves us 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.

The quotient of the division is 1690.49019607, and the remainder is 4.3e-08.