We look at the division of 681554 by 45 
The aim is to understand the frequency of 45 in 681554.

Moving on to step 1:
When dividing 6 by 45, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 45

Advancing to step 2:
68 divided by 45 is 1 with a remainder of 23.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 45 away from 68, we end up with 23.
Bring next digit (1) of the dividend behind the 23 and repeat the process: 231 / 45

Moving on to step 3:
231 divided by 45 is 5 with a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 225 from 231 and we're left with 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 45

Advancing to step 4:
If we divide 65 by 45, we get 1 and a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 151.0
Subtracting 45 from 65 leaves us with 20.
Grab the next digit (5) from the dividend, add it to 20, then carry on: 205 / 45

Step 5:
45 can be fit into 205 4 times, resulting in a remainder of 25.
The number 4 becomes the next digit in our result. 
Result so far: 1514.0
The remainder is 25 after subtracting 180 from 205.
Fetch the next digit (4) from the dividend, attach it to 25 and continue: 254 / 45

Step 6:
45 can be fit into 254 5 times, resulting in a remainder of 29.
Put 5 as the next digit of the answer. 
Result so far: 15145.0
If we subtract 225 from 254, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 7:
45 goes into 290 6 times with a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 15145.6
The remainder is 20 after subtracting 270 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
When dividing 200 by 45, we get 4 with a remainder of 20.
Use 4 as the next digit of our solution. 
Result so far: 15145.64
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
If we divide 200 by 45, we get 4 and a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 15145.644
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 15145.644 and a remainder of 0.002.