We divide 80900021 by 557
The aim is to understand the frequency of 557 in 80900021.

Going ahead to step 1:
557 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 557

On to step 2:
80 divided by 557 is 0 with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Bring next digit (9) of the dividend behind the 80 and repeat the process: 809 / 557

Moving on to step 3:
If we divide 809 by 557, we get 1 and a remainder of 252.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 557 from 809, we get 252.
Take the next digit (0) from the dividend and append it to 252, then repeat: 2520 / 557

Advancing to step 4:
When dividing 2520 by 557, we get 4 with a remainder of 292.
Use 4 as the next digit of our solution. 
Result so far: 14.0
If we take 2228 away from 2520, we end up with 292.
Include the next digit (0) from the dividend after 292, then repeat: 2920 / 557

On to step 5:
When dividing 2920 by 557, we get 5 with a remainder of 135.
Use 5 as the next digit of our solution. 
Result so far: 145.0
Subtracting 2785 from 2920 leaves us with 135.
Include the next digit (0) from the dividend after 135, then repeat: 1350 / 557

Going ahead to step 6:
557 goes into 1350 2 times with a remainder of 236.
Record the quotient 2 as the next digit in the result. 
Result so far: 1452.0
Subtract 1114 from 1350 to get 236.
Fetch the next digit (2) from the dividend, attach it to 236 and continue: 2362 / 557

Step 7:
If we divide 2362 by 557, we get 4 and a remainder of 134.
Use 4 as the next digit of our solution. 
Result so far: 14524.0
If we subtract 2228 from 2362, we get 134.
Include the next digit (1) from the dividend after 134, then repeat: 1341 / 557

Step 8:
557 goes into 1341 2 times with a remainder of 227.
The next digit of our result is 2. 
Result so far: 145242.0
Deduct 1114 from 1341 and we're left with 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

On to step 9:
557 goes into 2270 4 times with a remainder of 42.
The number 4 becomes the next digit in our result. 
Result so far: 145242.4
The remainder is 42 after subtracting 2228 from 2270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 10:
420 divided by 557 is 0 with a remainder of 420.
Put 0 as the next digit of the answer. 
Result so far: 145242.4
Subtract 0 from 420 to get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Going ahead to step 11:
If we divide 4200 by 557, we get 7 and a remainder of 301.
Write down 7 as next digit of the result. 
Result so far: 145242.407
If we subtract 3899 from 4200, we get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Moving on to step 12:
3010 divided by 557 is 5 with a remainder of 225.
The next digit of our result is 5. 
Result so far: 145242.4075
The remainder is 225 after subtracting 2785 from 3010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Advancing to step 13:
The number 557 fits into 2250 4 times, leaving a remainder of 22.
The next digit of our result is 4. 
Result so far: 145242.40754
Subtract 2228 from 2250 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 14:
The number 557 fits into 220 0 times, leaving a remainder of 220.
Record the quotient 0 as the next digit in the result. 
Result so far: 145242.40754
Subtract 0 from 220 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 15:
The number 557 fits into 2200 3 times, leaving a remainder of 529.
Record the quotient 3 as the next digit in the result. 
Result so far: 145242.4075403
If we subtract 1671 from 2200, 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.

Advancing to step 16:
557 goes into 5290 9 times with a remainder of 277.
Write down 9 as next digit of the result. 
Result so far: 145242.40754039
Subtracting 5013 from 5290 leaves us with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

After the division, we end up with 145242.40754039 and a remainder of 2.77e-07.