We look at the division of 37784 by 15 
The aim is to understand the frequency of 15 in 37784.

On to step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 15

On to step 2:
15 can be fit into 37 2 times, resulting in a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 7 after subtracting 30 from 37.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 15

Let's proceed to step 3:
15 goes into 77 5 times with a remainder of 2.
The next digit of our result is 5. 
Result so far: 25.0
The remainder is 2 after subtracting 75 from 77.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 15

Let's proceed to step 4:
The number 15 fits into 28 1 times, leaving a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 251.0
The remainder is 13 after subtracting 15 from 28.
Append the next digit (4) from the dividend to 13 and continue with: 134 / 15

Let's proceed to step 5:
15 goes into 134 8 times with a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 2518.0
Subtracting 120 from 134 leaves us 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 6:
15 goes into 140 9 times with a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 2518.9
Subtract 135 from 140 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 7:
15 goes into 50 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 2518.93
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 2518.933
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 2518.933, and the remainder is 0.0005.