We look at the division of 879858 by 61 
The aim is to understand the frequency of 61 in 879858.

Let's proceed to step 1:
61 goes into 8 0 times 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.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 61

Going ahead to step 2:
61 can be fit into 87 1 times, resulting in a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 61 from 87 to get 26.
Bring next digit (9) of the dividend behind the 26 and repeat the process: 269 / 61

Advancing to step 3:
When dividing 269 by 61, we get 4 with a remainder of 25.
Write down 4 as next digit of the result. 
Result so far: 14.0
If we subtract 244 from 269, we get 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 61

Let's proceed to step 4:
61 goes into 258 4 times with a remainder of 14.
The next digit of our result is 4. 
Result so far: 144.0
If we subtract 244 from 258, we get 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 61

Going ahead to step 5:
145 divided by 61 is 2 with a remainder of 23.
Write down 2 as next digit of the result. 
Result so far: 1442.0
If we take 122 away from 145, we end up with 23.
Bring next digit (8) of the dividend behind the 23 and repeat the process: 238 / 61

Let's proceed to step 6:
If we divide 238 by 61, we get 3 and a remainder of 55.
Record the quotient 3 as the next digit in the result. 
Result so far: 14423.0
The remainder is 55 after subtracting 183 from 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 7:
61 can be fit into 550 9 times, resulting in a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 14423.9
Subtract 549 from 550 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 8:
The number 61 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 14423.9
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
When dividing 100 by 61, we get 1 with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 14423.901
The remainder is 39 after subtracting 61 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 10:
390 divided by 61 is 6 with a remainder of 24.
The next digit of our result is 6. 
Result so far: 14423.9016
Deduct 366 from 390 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 11:
61 goes into 240 3 times with a remainder of 57.
Use 3 as the next digit of our solution. 
Result so far: 14423.90163
Subtract 183 from 240 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 12:
61 goes into 570 9 times with a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 14423.901639
Subtracting 549 from 570 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 13:
If we divide 210 by 61, we get 3 and a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 14423.9016393
Deduct 183 from 210 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 14:
If we divide 270 by 61, we get 4 and a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 14423.90163934
Subtracting 244 from 270 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final outcome is 14423.90163934, with a leftover of 2.6e-08.