We look at the division of 70121581 by 689 
The aim is to understand the frequency of 689 in 70121581.

Going ahead to step 1:
The number 689 fits into 7 0 times, leaving a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 689

Step 2:
689 goes into 70 0 times with a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 70, we get 70.
Bring next digit (1) of the dividend behind the 70 and repeat the process: 701 / 689

Going ahead to step 3:
If we divide 701 by 689, we get 1 and a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 689 from 701 leaves us with 12.
Append the next digit (2) from the dividend to 12 and continue with: 122 / 689

Let's proceed to step 4:
689 can be fit into 122 0 times, resulting in a remainder of 122.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 122 leaves us with 122.
Append the next digit (1) from the dividend to 122 and continue with: 1221 / 689

Advancing to step 5:
The number 689 fits into 1221 1 times, leaving a remainder of 532.
Use 1 as the next digit of our solution. 
Result so far: 101.0
If we subtract 689 from 1221, we get 532.
Take the next digit (5) from the dividend and append it to 532, then repeat: 5325 / 689

Going ahead to step 6:
When dividing 5325 by 689, we get 7 with a remainder of 502.
The number 7 becomes the next digit in our result. 
Result so far: 1017.0
Subtracting 4823 from 5325 leaves us with 502.
Fetch the next digit (8) from the dividend, attach it to 502 and continue: 5028 / 689

Let's proceed to step 7:
The number 689 fits into 5028 7 times, leaving a remainder of 205.
The number 7 becomes the next digit in our result. 
Result so far: 10177.0
Subtracting 4823 from 5028 leaves us with 205.
Fetch the next digit (1) from the dividend, attach it to 205 and continue: 2051 / 689

Step 8:
If we divide 2051 by 689, we get 2 and a remainder of 673.
The number 2 becomes the next digit in our result. 
Result so far: 101772.0
If we subtract 1378 from 2051, we get 673.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6730, and continue the process.

Step 9:
When dividing 6730 by 689, we get 9 with a remainder of 529.
The number 9 becomes the next digit in our result. 
Result so far: 101772.9
If we subtract 6201 from 6730, we get 529.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5290, and continue the process.

On to step 10:
When dividing 5290 by 689, we get 7 with a remainder of 467.
Use 7 as the next digit of our solution. 
Result so far: 101772.97
Subtract 4823 from 5290 to get 467.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4670, and continue the process.

Step 11:
689 goes into 4670 6 times with a remainder of 536.
The number 6 becomes the next digit in our result. 
Result so far: 101772.976
If we take 4134 away from 4670, we end up with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

On to step 12:
The number 689 fits into 5360 7 times, leaving a remainder of 537.
Put 7 as the next digit of the answer. 
Result so far: 101772.9767
Deduct 4823 from 5360 and we're left with 537.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5370, and continue the process.

Moving on to step 13:
The number 689 fits into 5370 7 times, leaving a remainder of 547.
The next digit of our result is 7. 
Result so far: 101772.97677
Subtracting 4823 from 5370 leaves us with 547.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

The final outcome is 101772.97677, with a leftover of 0.000547.