We look at the division of 80490786 by 639 
The aim is to understand the frequency of 639 in 80490786.

Moving on to step 1:
The number 639 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 639

Moving on to step 2:
639 can be fit into 80 0 times, resulting in a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Bring next digit (4) of the dividend behind the 80 and repeat the process: 804 / 639

On to step 3:
639 can be fit into 804 1 times, resulting in a remainder of 165.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 639 from 804 leaves us with 165.
Bring next digit (9) of the dividend behind the 165 and repeat the process: 1659 / 639

Step 4:
1659 divided by 639 is 2 with a remainder of 381.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 1278 from 1659, we get 381.
Take the next digit (0) from the dividend and append it to 381, then repeat: 3810 / 639

Let's proceed to step 5:
639 goes into 3810 5 times with a remainder of 615.
Put 5 as the next digit of the answer. 
Result so far: 125.0
Subtract 3195 from 3810 to get 615.
Include the next digit (7) from the dividend after 615, then repeat: 6157 / 639

Advancing to step 6:
6157 divided by 639 is 9 with a remainder of 406.
Put 9 as the next digit of the answer. 
Result so far: 1259.0
Subtracting 5751 from 6157 leaves us with 406.
Fetch the next digit (8) from the dividend, attach it to 406 and continue: 4068 / 639

Let's proceed to step 7:
When dividing 4068 by 639, we get 6 with a remainder of 234.
The number 6 becomes the next digit in our result. 
Result so far: 12596.0
Subtract 3834 from 4068 to get 234.
Append the next digit (6) from the dividend to 234 and continue with: 2346 / 639

Moving on to step 8:
The number 639 fits into 2346 3 times, leaving a remainder of 429.
Write down 3 as next digit of the result. 
Result so far: 125963.0
Deduct 1917 from 2346 and we're left with 429.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4290, and continue the process.

Step 9:
639 goes into 4290 6 times with a remainder of 456.
Use 6 as the next digit of our solution. 
Result so far: 125963.6
Subtracting 3834 from 4290 leaves us with 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Moving on to step 10:
639 goes into 4560 7 times with a remainder of 87.
Write down 7 as next digit of the result. 
Result so far: 125963.67
Subtract 4473 from 4560 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 11:
639 can be fit into 870 1 times, resulting in a remainder of 231.
Record the quotient 1 as the next digit in the result. 
Result so far: 125963.671
The remainder is 231 after subtracting 639 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Step 12:
639 can be fit into 2310 3 times, resulting in a remainder of 393.
Record the quotient 3 as the next digit in the result. 
Result so far: 125963.6713
The remainder is 393 after subtracting 1917 from 2310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Let's proceed to step 13:
If we divide 3930 by 639, we get 6 and a remainder of 96.
The next digit of our result is 6. 
Result so far: 125963.67136
Subtract 3834 from 3930 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Let's proceed to step 14:
639 can be fit into 960 1 times, resulting in a remainder of 321.
Use 1 as the next digit of our solution. 
Result so far: 125963.671361
The remainder is 321 after subtracting 639 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Step 15:
639 can be fit into 3210 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 125963.6713615
Subtract 3195 from 3210 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 16:
150 divided by 639 is 0 with a remainder of 150.
The number 0 becomes the next digit in our result. 
Result so far: 125963.6713615
Subtract 0 from 150 to get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The quotient of the division is 125963.6713615, and the remainder is 1.5e-07.