We're dividing 83391520 by 570 
The aim is to understand the frequency of 570 in 83391520.

Step 1:
8 divided by 570 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 570

Let's proceed to step 2:
570 goes into 83 0 times with a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 83 leaves us with 83.
Fetch the next digit (3) from the dividend, attach it to 83 and continue: 833 / 570

Step 3:
If we divide 833 by 570, we get 1 and a remainder of 263.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 570 from 833 to get 263.
Append the next digit (9) from the dividend to 263 and continue with: 2639 / 570

On to step 4:
570 goes into 2639 4 times with a remainder of 359.
The next digit of our result is 4. 
Result so far: 14.0
Subtracting 2280 from 2639 leaves us with 359.
Fetch the next digit (1) from the dividend, attach it to 359 and continue: 3591 / 570

Step 5:
570 goes into 3591 6 times with a remainder of 171.
Record the quotient 6 as the next digit in the result. 
Result so far: 146.0
Subtract 3420 from 3591 to get 171.
Include the next digit (5) from the dividend after 171, then repeat: 1715 / 570

Step 6:
570 goes into 1715 3 times with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 1463.0
Subtracting 1710 from 1715 leaves us with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 570

Let's proceed to step 7:
570 goes into 52 0 times with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 14630.0
If we subtract 0 from 52, we get 52.
Bring next digit (0) of the dividend behind the 52 and repeat the process: 520 / 570

On to step 8:
The number 570 fits into 520 0 times, leaving a remainder of 520.
Put 0 as the next digit of the answer. 
Result so far: 146300.0
Subtract 0 from 520 to get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Going ahead to step 9:
5200 divided by 570 is 9 with a remainder of 70.
Put 9 as the next digit of the answer. 
Result so far: 146300.9
If we subtract 5130 from 5200, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 10:
570 goes into 700 1 times with a remainder of 130.
Put 1 as the next digit of the answer. 
Result so far: 146300.91
If we take 570 away from 700, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 11:
570 can be fit into 1300 2 times, resulting in a remainder of 160.
The next digit of our result is 2. 
Result so far: 146300.912
Subtract 1140 from 1300 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 12:
570 goes into 1600 2 times with a remainder of 460.
The next digit of our result is 2. 
Result so far: 146300.9122
Deduct 1140 from 1600 and we're left with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

After the division, we end up with 146300.9122 and a remainder of 0.0046.