521770 ÷ 19 
The aim is to understand the frequency of 19 in 521770.

Let's proceed to step 1:
19 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 19

Going ahead to step 2:
52 divided by 19 is 2 with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 38 away from 52, we end up with 14.
Bring next digit (1) of the dividend behind the 14 and repeat the process: 141 / 19

Step 3:
When dividing 141 by 19, we get 7 with a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
If we take 133 away from 141, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 19

Advancing to step 4:
19 can be fit into 87 4 times, resulting in a remainder of 11.
The next digit of our result is 4. 
Result so far: 274.0
If we subtract 76 from 87, we get 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 19

Advancing to step 5:
19 can be fit into 117 6 times, resulting in a remainder of 3.
The next digit of our result is 6. 
Result so far: 2746.0
If we subtract 114 from 117, we get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 19

On to step 6:
When dividing 30 by 19, we get 1 with a remainder of 11.
The next digit of our result is 1. 
Result so far: 27461.0
If we subtract 19 from 30, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
19 can be fit into 110 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 27461.5
If we subtract 95 from 110, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
When dividing 150 by 19, we get 7 with a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 27461.57
If we take 133 away from 150, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 9:
170 divided by 19 is 8 with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 27461.578
If we subtract 152 from 170, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
The number 19 fits into 180 9 times, leaving a remainder of 9.
The next digit of our result is 9. 
Result so far: 27461.5789
If we take 171 away from 180, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
19 goes into 90 4 times with a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 27461.57894
If we subtract 76 from 90, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 12:
If we divide 140 by 19, we get 7 and a remainder of 7.
The next digit of our result is 7. 
Result so far: 27461.578947
The remainder is 7 after subtracting 133 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 13:
19 goes into 70 3 times with a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 27461.5789473
The remainder is 13 after subtracting 57 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 14:
When dividing 130 by 19, we get 6 with a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 27461.57894736
Subtracting 114 from 130 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 27461.57894736 and a remainder of 1.6e-08.