61618949 ÷ 18 
The aim is to understand the frequency of 18 in 61618949.

On to step 1:
18 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 18

On to step 2:
18 can be fit into 61 3 times, resulting in a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 54 from 61 and we're left with 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 18

On to step 3:
18 goes into 76 4 times with a remainder of 4.
The next digit of our result is 4. 
Result so far: 34.0
If we take 72 away from 76, we end up with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 18

Moving on to step 4:
41 divided by 18 is 2 with a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 342.0
If we take 36 away from 41, we end up with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 18

On to step 5:
18 can be fit into 58 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 3423.0
Deduct 54 from 58 and we're left with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 18

Let's proceed to step 6:
18 can be fit into 49 2 times, resulting in a remainder of 13.
The next digit of our result is 2. 
Result so far: 34232.0
Subtracting 36 from 49 leaves us with 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 18

Moving on to step 7:
If we divide 134 by 18, we get 7 and a remainder of 8.
Use 7 as the next digit of our solution. 
Result so far: 342327.0
Deduct 126 from 134 and we're left with 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 18

Going ahead to step 8:
18 can be fit into 89 4 times, resulting in a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 3423274.0
Subtracting 72 from 89 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.

On to step 9:
When dividing 170 by 18, we get 9 with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 3423274.9
The remainder is 8 after subtracting 162 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
18 can be fit into 80 4 times, resulting in a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 3423274.94
Deduct 72 from 80 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.

On to step 11:
If we divide 80 by 18, we get 4 and a remainder of 8.
The next digit of our result is 4. 
Result so far: 3423274.944
Subtracting 72 from 80 leaves us 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.

Our division results in 3423274.944 with a remaining 0.0008.