We divide 302991 by 19
The aim is to understand the frequency of 19 in 302991.

On to step 1:
19 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 19

Let's proceed to step 2:
30 divided by 19 is 1 with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 19 away from 30, we end up with 11.
Include the next digit (2) from the dividend after 11, then repeat: 112 / 19

Moving on to step 3:
19 goes into 112 5 times with a remainder of 17.
The next digit of our result is 5. 
Result so far: 15.0
If we take 95 away from 112, we end up with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 19

Step 4:
When dividing 179 by 19, we get 9 with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
If we subtract 171 from 179, we get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 19

Advancing to step 5:
19 goes into 89 4 times with a remainder of 13.
The number 4 becomes the next digit in our result. 
Result so far: 1594.0
If we subtract 76 from 89, we get 13.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 19

Step 6:
131 divided by 19 is 6 with a remainder of 17.
Use 6 as the next digit of our solution. 
Result so far: 15946.0
Subtracting 114 from 131 leaves us 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 7:
If we divide 170 by 19, we get 8 and a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 15946.8
The remainder is 18 after subtracting 152 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 8:
The number 19 fits into 180 9 times, leaving a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 15946.89
Subtracting 171 from 180 leaves us 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.

Advancing to step 9:
90 divided by 19 is 4 with a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 15946.894
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.

Step 10:
If we divide 140 by 19, we get 7 and a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 15946.8947
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 11:
The number 19 fits into 70 3 times, leaving a remainder of 13.
The next digit of our result is 3. 
Result so far: 15946.89473
Subtract 57 from 70 to get 13.
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 12:
When dividing 130 by 19, we get 6 with a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 15946.894736
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.

On to step 13:
When dividing 160 by 19, we get 8 with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 15946.8947368
If we subtract 152 from 160, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
80 divided by 19 is 4 with a remainder of 4.
The next digit of our result is 4. 
Result so far: 15946.89473684
If we take 76 away from 80, 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.

After the division, we end up with 15946.89473684 and a remainder of 4e-09.