42516 ÷ 1 
The aim is to understand the frequency of 1 in 42516.

Step 1:
When dividing 4 by 1, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 4 from 4 to get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 1

Step 2:
1 goes into 2 2 times with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 42.0
The remainder is 0 after subtracting 2 from 2.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 1

On to step 3:
The number 1 fits into 5 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 425.0
Subtracting 5 from 5 leaves us with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

Advancing to step 4:
When dividing 1 by 1, we get 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 4251.0
Subtract 1 from 1 to get 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 1

Moving on to step 5:
6 divided by 1 is 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 42516.0
Subtracting 6 from 6 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 6:
When dividing 0 by 1, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42516.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 42516.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 42516.0 and a remainder of 0.0.