We look at the division of 89986110 by 639 
The aim is to understand the frequency of 639 in 89986110.

Step 1:
If we divide 8 by 639, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 639

On to step 2:
639 can be fit into 89 0 times, resulting in a remainder of 89.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 89, we get 89.
Take the next digit (9) from the dividend and append it to 89, then repeat: 899 / 639

Let's proceed to step 3:
If we divide 899 by 639, we get 1 and a remainder of 260.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 639 from 899 and we're left with 260.
Take the next digit (8) from the dividend and append it to 260, then repeat: 2608 / 639

Advancing to step 4:
639 can be fit into 2608 4 times, resulting in a remainder of 52.
Write down 4 as next digit of the result. 
Result so far: 14.0
The remainder is 52 after subtracting 2556 from 2608.
Append the next digit (6) from the dividend to 52 and continue with: 526 / 639

Step 5:
When dividing 526 by 639, we get 0 with a remainder of 526.
Record the quotient 0 as the next digit in the result. 
Result so far: 140.0
Subtract 0 from 526 to get 526.
Append the next digit (1) from the dividend to 526 and continue with: 5261 / 639

Moving on to step 6:
5261 divided by 639 is 8 with a remainder of 149.
Use 8 as the next digit of our solution. 
Result so far: 1408.0
If we take 5112 away from 5261, we end up with 149.
Take the next digit (1) from the dividend and append it to 149, then repeat: 1491 / 639

Advancing to step 7:
639 can be fit into 1491 2 times, resulting in a remainder of 213.
Put 2 as the next digit of the answer. 
Result so far: 14082.0
If we take 1278 away from 1491, we end up with 213.
Grab the next digit (0) from the dividend, add it to 213, then carry on: 2130 / 639

Advancing to step 8:
639 can be fit into 2130 3 times, resulting in a remainder of 213.
Use 3 as the next digit of our solution. 
Result so far: 140823.0
The remainder is 213 after subtracting 1917 from 2130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Step 9:
When dividing 2130 by 639, we get 3 with a remainder of 213.
The number 3 becomes the next digit in our result. 
Result so far: 140823.3
If we subtract 1917 from 2130, we get 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Going ahead to step 10:
2130 divided by 639 is 3 with a remainder of 213.
The number 3 becomes the next digit in our result. 
Result so far: 140823.33
If we subtract 1917 from 2130, we get 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Our division results in 140823.33 with a remaining 0.213.