18611621 divided by 689 
The aim is to understand the frequency of 689 in 18611621.

On to step 1:
1 divided by 689 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 689

Going ahead to step 2:
If we divide 18 by 689, we get 0 and a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 18 after subtracting 0 from 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 689

Advancing to step 3:
When dividing 186 by 689, we get 0 with a remainder of 186.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 186 and we're left with 186.
Include the next digit (1) from the dividend after 186, then repeat: 1861 / 689

Let's proceed to step 4:
689 goes into 1861 2 times with a remainder of 483.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1378 away from 1861, we end up with 483.
Append the next digit (1) from the dividend to 483 and continue with: 4831 / 689

Step 5:
4831 divided by 689 is 7 with a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 27.0
Subtracting 4823 from 4831 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 689

Going ahead to step 6:
If we divide 86 by 689, we get 0 and a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 270.0
Subtract 0 from 86 to get 86.
Take the next digit (2) from the dividend and append it to 86, then repeat: 862 / 689

Going ahead to step 7:
The number 689 fits into 862 1 times, leaving a remainder of 173.
Use 1 as the next digit of our solution. 
Result so far: 2701.0
Subtract 689 from 862 to get 173.
Fetch the next digit (1) from the dividend, attach it to 173 and continue: 1731 / 689

Let's proceed to step 8:
1731 divided by 689 is 2 with a remainder of 353.
Put 2 as the next digit of the answer. 
Result so far: 27012.0
Deduct 1378 from 1731 and we're left with 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

Advancing to step 9:
The number 689 fits into 3530 5 times, leaving a remainder of 85.
The next digit of our result is 5. 
Result so far: 27012.5
Subtracting 3445 from 3530 leaves us with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

On to step 10:
689 goes into 850 1 times with a remainder of 161.
Record the quotient 1 as the next digit in the result. 
Result so far: 27012.51
Subtract 689 from 850 to get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Advancing to step 11:
When dividing 1610 by 689, we get 2 with a remainder of 232.
The number 2 becomes the next digit in our result. 
Result so far: 27012.512
Subtracting 1378 from 1610 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 12:
If we divide 2320 by 689, we get 3 and a remainder of 253.
The number 3 becomes the next digit in our result. 
Result so far: 27012.5123
If we subtract 2067 from 2320, we get 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

Advancing to step 13:
If we divide 2530 by 689, we get 3 and a remainder of 463.
Write down 3 as next digit of the result. 
Result so far: 27012.51233
Deduct 2067 from 2530 and we're left with 463.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4630, and continue the process.

After the division, we end up with 27012.51233 and a remainder of 0.000463.