We look at the division of 921979 by 75 
The aim is to understand the frequency of 75 in 921979.

Step 1:
If we divide 9 by 75, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 75

Going ahead to step 2:
75 can be fit into 92 1 times, resulting in a remainder of 17.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 75 from 92 and we're left with 17.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 75

Moving on to step 3:
The number 75 fits into 171 2 times, leaving a remainder of 21.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Deduct 150 from 171 and we're left with 21.
Grab the next digit (9) from the dividend, add it to 21, then carry on: 219 / 75

Going ahead to step 4:
75 goes into 219 2 times with a remainder of 69.
The next digit of our result is 2. 
Result so far: 122.0
Deduct 150 from 219 and we're left with 69.
Fetch the next digit (7) from the dividend, attach it to 69 and continue: 697 / 75

On to step 5:
When dividing 697 by 75, we get 9 with a remainder of 22.
The next digit of our result is 9. 
Result so far: 1229.0
If we take 675 away from 697, we end up with 22.
Fetch the next digit (9) from the dividend, attach it to 22 and continue: 229 / 75

Advancing to step 6:
229 divided by 75 is 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 12293.0
If we take 225 away from 229, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
If we divide 40 by 75, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 12293.0
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.

Going ahead to step 8:
If we divide 400 by 75, we get 5 and a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 12293.05
Subtracting 375 from 400 leaves us 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.

Step 9:
75 goes into 250 3 times with a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 12293.053
The remainder is 25 after subtracting 225 from 250.
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 10:
If we divide 250 by 75, we get 3 and a remainder of 25.
Put 3 as the next digit of the answer. 
Result so far: 12293.0533
Subtracting 225 from 250 leaves us 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.

The quotient of the division is 12293.0533, and the remainder is 0.00025.