We look at the division of 71521907 by 105 
The aim is to understand the frequency of 105 in 71521907.

Moving on to step 1:
The number 105 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 105

Let's proceed to step 2:
If we divide 71 by 105, we get 0 and a remainder of 71.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 71 and we're left with 71.
Grab the next digit (5) from the dividend, add it to 71, then carry on: 715 / 105

Let's proceed to step 3:
105 goes into 715 6 times with a remainder of 85.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 630 from 715, we get 85.
Include the next digit (2) from the dividend after 85, then repeat: 852 / 105

On to step 4:
105 can be fit into 852 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 68.0
Deduct 840 from 852 and we're left with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 105

On to step 5:
The number 105 fits into 121 1 times, leaving a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 681.0
Subtracting 105 from 121 leaves us with 16.
Grab the next digit (9) from the dividend, add it to 16, then carry on: 169 / 105

Advancing to step 6:
105 can be fit into 169 1 times, resulting in a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 6811.0
If we subtract 105 from 169, we get 64.
Bring next digit (0) of the dividend behind the 64 and repeat the process: 640 / 105

Going ahead to step 7:
105 can be fit into 640 6 times, resulting in a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 68116.0
The remainder is 10 after subtracting 630 from 640.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 105

Going ahead to step 8:
105 can be fit into 107 1 times, resulting in a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 681161.0
The remainder is 2 after subtracting 105 from 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
105 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 681161.0
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
The number 105 fits into 200 1 times, leaving a remainder of 95.
The number 1 becomes the next digit in our result. 
Result so far: 681161.01
Subtract 105 from 200 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 11:
950 divided by 105 is 9 with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 681161.019
The remainder is 5 after subtracting 945 from 950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
50 divided by 105 is 0 with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 681161.019
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 13:
The number 105 fits into 500 4 times, leaving a remainder of 80.
The next digit of our result is 4. 
Result so far: 681161.01904
Subtracting 420 from 500 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.

Advancing to step 14:
800 divided by 105 is 7 with a remainder of 65.
The next digit of our result is 7. 
Result so far: 681161.019047
If we subtract 735 from 800, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 15:
If we divide 650 by 105, we get 6 and a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 681161.0190476
Subtract 630 from 650 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 16:
The number 105 fits into 200 1 times, leaving a remainder of 95.
The number 1 becomes the next digit in our result. 
Result so far: 681161.01904761
The remainder is 95 after subtracting 105 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

In conclusion, the division gives 681161.01904761 with a balance of 9.5e-08.