We look at the division of 664490 by 19 
The aim is to understand the frequency of 19 in 664490.

Moving on to step 1:
The number 19 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 19

Moving on to step 2:
If we divide 66 by 19, we get 3 and a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 57 away from 66, we end up with 9.
Grab the next digit (4) from the dividend, add it to 9, then carry on: 94 / 19

Moving on to step 3:
When dividing 94 by 19, we get 4 with a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 34.0
Subtract 76 from 94 to get 18.
Append the next digit (4) from the dividend to 18 and continue with: 184 / 19

On to step 4:
The number 19 fits into 184 9 times, leaving a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 349.0
If we subtract 171 from 184, we get 13.
Append the next digit (9) from the dividend to 13 and continue with: 139 / 19

Going ahead to step 5:
When dividing 139 by 19, we get 7 with a remainder of 6.
The next digit of our result is 7. 
Result so far: 3497.0
Subtract 133 from 139 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 19

Step 6:
19 goes into 60 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 34973.0
Deduct 57 from 60 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
19 can be fit into 30 1 times, resulting in a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 34973.1
The remainder is 11 after subtracting 19 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 8:
When dividing 110 by 19, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 34973.15
Subtracting 95 from 110 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
19 goes into 150 7 times with a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 34973.157
Deduct 133 from 150 and we're left 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.

On to step 10:
When dividing 170 by 19, we get 8 with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 34973.1578
Deduct 152 from 170 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
180 divided by 19 is 9 with a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 34973.15789
Subtract 171 from 180 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 12:
19 can be fit into 90 4 times, resulting in a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 34973.157894
Deduct 76 from 90 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 13:
When dividing 140 by 19, we get 7 with a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 34973.1578947
Subtract 133 from 140 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 14:
The number 19 fits into 70 3 times, leaving a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 34973.15789473
Deduct 57 from 70 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 34973.15789473 and a remainder of 1.3e-08.