689946 ÷ 90 
The aim is to understand the frequency of 90 in 689946.

Let's proceed to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 90

Moving on to step 2:
If we divide 68 by 90, we get 0 and a remainder of 68.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 68 and we're left with 68.
Take the next digit (9) from the dividend and append it to 68, then repeat: 689 / 90

Let's proceed to step 3:
The number 90 fits into 689 7 times, leaving a remainder of 59.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 630 from 689 leaves us with 59.
Append the next digit (9) from the dividend to 59 and continue with: 599 / 90

Step 4:
When dividing 599 by 90, we get 6 with a remainder of 59.
Use 6 as the next digit of our solution. 
Result so far: 76.0
If we take 540 away from 599, we end up with 59.
Append the next digit (4) from the dividend to 59 and continue with: 594 / 90

Advancing to step 5:
90 can be fit into 594 6 times, resulting in a remainder of 54.
The next digit of our result is 6. 
Result so far: 766.0
If we take 540 away from 594, we end up with 54.
Include the next digit (6) from the dividend after 54, then repeat: 546 / 90

Advancing to step 6:
90 goes into 546 6 times with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 7666.0
If we subtract 540 from 546, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
If we divide 60 by 90, we get 0 and a remainder of 60.
The next digit of our result is 0. 
Result so far: 7666.0
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 7666.06
Subtracting 540 from 600 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
600 divided by 90 is 6 with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 7666.066
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The quotient of the division is 7666.066, and the remainder is 0.006.