61718089 ÷ 561 
The aim is to understand the frequency of 561 in 61718089.

Let's proceed to step 1:
6 divided by 561 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 561

Advancing to step 2:
61 divided by 561 is 0 with a remainder of 61.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 61 and we're left with 61.
Fetch the next digit (7) from the dividend, attach it to 61 and continue: 617 / 561

Step 3:
617 divided by 561 is 1 with a remainder of 56.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 561 away from 617, we end up with 56.
Bring next digit (1) of the dividend behind the 56 and repeat the process: 561 / 561

Going ahead to step 4:
561 can be fit into 561 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we take 561 away from 561, we end up with 0.
Take the next digit (8) from the dividend and append it to 0, then repeat: 8 / 561

Going ahead to step 5:
The number 561 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 110.0
Subtract 0 from 8 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 561

Going ahead to step 6:
If we divide 80 by 561, we get 0 and a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 1100.0
If we take 0 away from 80, we end up with 80.
Take the next digit (8) from the dividend and append it to 80, then repeat: 808 / 561

On to step 7:
561 can be fit into 808 1 times, resulting in a remainder of 247.
Record the quotient 1 as the next digit in the result. 
Result so far: 11001.0
Deduct 561 from 808 and we're left with 247.
Fetch the next digit (9) from the dividend, attach it to 247 and continue: 2479 / 561

Step 8:
When dividing 2479 by 561, we get 4 with a remainder of 235.
The number 4 becomes the next digit in our result. 
Result so far: 110014.0
Subtract 2244 from 2479 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 9:
561 goes into 2350 4 times with a remainder of 106.
Put 4 as the next digit of the answer. 
Result so far: 110014.4
The remainder is 106 after subtracting 2244 from 2350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Going ahead to step 10:
When dividing 1060 by 561, we get 1 with a remainder of 499.
Record the quotient 1 as the next digit in the result. 
Result so far: 110014.41
The remainder is 499 after subtracting 561 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Moving on to step 11:
4990 divided by 561 is 8 with a remainder of 502.
Put 8 as the next digit of the answer. 
Result so far: 110014.418
Deduct 4488 from 4990 and we're left with 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

On to step 12:
5020 divided by 561 is 8 with a remainder of 532.
Record the quotient 8 as the next digit in the result. 
Result so far: 110014.4188
Subtracting 4488 from 5020 leaves us with 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

The quotient of the division is 110014.4188, and the remainder is 0.00532.