We're dividing 53999545 by 689 
The aim is to understand the frequency of 689 in 53999545.

Going ahead to step 1:
When dividing 5 by 689, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 689

Going ahead to step 2:
53 divided by 689 is 0 with a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 53 to get 53.
Grab the next digit (9) from the dividend, add it to 53, then carry on: 539 / 689

Let's proceed to step 3:
When dividing 539 by 689, we get 0 with a remainder of 539.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 539, we end up with 539.
Grab the next digit (9) from the dividend, add it to 539, then carry on: 5399 / 689

Going ahead to step 4:
689 can be fit into 5399 7 times, resulting in a remainder of 576.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
The remainder is 576 after subtracting 4823 from 5399.
Include the next digit (9) from the dividend after 576, then repeat: 5769 / 689

Let's proceed to step 5:
The number 689 fits into 5769 8 times, leaving a remainder of 257.
Put 8 as the next digit of the answer. 
Result so far: 78.0
Subtract 5512 from 5769 to get 257.
Fetch the next digit (5) from the dividend, attach it to 257 and continue: 2575 / 689

Step 6:
If we divide 2575 by 689, we get 3 and a remainder of 508.
Write down 3 as next digit of the result. 
Result so far: 783.0
If we subtract 2067 from 2575, we get 508.
Append the next digit (4) from the dividend to 508 and continue with: 5084 / 689

Going ahead to step 7:
If we divide 5084 by 689, we get 7 and a remainder of 261.
Record the quotient 7 as the next digit in the result. 
Result so far: 7837.0
Deduct 4823 from 5084 and we're left with 261.
Bring next digit (5) of the dividend behind the 261 and repeat the process: 2615 / 689

Moving on to step 8:
The number 689 fits into 2615 3 times, leaving a remainder of 548.
The number 3 becomes the next digit in our result. 
Result so far: 78373.0
The remainder is 548 after subtracting 2067 from 2615.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

On to step 9:
The number 689 fits into 5480 7 times, leaving a remainder of 657.
The next digit of our result is 7. 
Result so far: 78373.7
Deduct 4823 from 5480 and we're left with 657.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6570, and continue the process.

Going ahead to step 10:
689 goes into 6570 9 times with a remainder of 369.
Put 9 as the next digit of the answer. 
Result so far: 78373.79
Subtracting 6201 from 6570 leaves us with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Going ahead to step 11:
3690 divided by 689 is 5 with a remainder of 245.
The next digit of our result is 5. 
Result so far: 78373.795
Deduct 3445 from 3690 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Moving on to step 12:
If we divide 2450 by 689, we get 3 and a remainder of 383.
Record the quotient 3 as the next digit in the result. 
Result so far: 78373.7953
Subtract 2067 from 2450 to get 383.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

Let's proceed to step 13:
689 goes into 3830 5 times with a remainder of 385.
The next digit of our result is 5. 
Result so far: 78373.79535
Subtract 3445 from 3830 to get 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

On to step 14:
3850 divided by 689 is 5 with a remainder of 405.
Put 5 as the next digit of the answer. 
Result so far: 78373.795355
Subtract 3445 from 3850 to get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

The final outcome is 78373.795355, with a leftover of 4.05e-05.