251121 ÷ 19 
The aim is to understand the frequency of 19 in 251121.

Let's proceed to step 1:
The number 19 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 19

Advancing to step 2:
19 goes into 25 1 times with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 6 after subtracting 19 from 25.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 19

On to step 3:
If we divide 61 by 19, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we subtract 57 from 61, we get 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 19

Going ahead to step 4:
If we divide 41 by 19, we get 2 and a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 132.0
The remainder is 3 after subtracting 38 from 41.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 19

Advancing to step 5:
The number 19 fits into 32 1 times, leaving a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1321.0
If we take 19 away from 32, we end up with 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 19

Advancing to step 6:
When dividing 131 by 19, we get 6 with a remainder of 17.
The next digit of our result is 6. 
Result so far: 13216.0
The remainder is 17 after subtracting 114 from 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 7:
19 can be fit into 170 8 times, resulting in a remainder of 18.
The next digit of our result is 8. 
Result so far: 13216.8
Subtract 152 from 170 to 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.

Let's proceed to step 8:
19 can be fit into 180 9 times, resulting in a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 13216.89
If we subtract 171 from 180, we 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 9:
19 can be fit into 90 4 times, resulting in a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 13216.894
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.

Step 10:
19 goes into 140 7 times with a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 13216.8947
If we subtract 133 from 140, we 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.

Advancing to step 11:
The number 19 fits into 70 3 times, leaving a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 13216.89473
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.

Going ahead to step 12:
19 can be fit into 130 6 times, resulting in a remainder of 16.
The number 6 becomes the next digit in our result. 
Result so far: 13216.894736
If we take 114 away from 130, we end up 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.

Moving on to step 13:
19 goes into 160 8 times with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 13216.8947368
Deduct 152 from 160 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
If we divide 80 by 19, we get 4 and a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 13216.89473684
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 13216.89473684 and a remainder of 4e-09.