87132225 ÷ 990 
The aim is to understand the frequency of 990 in 87132225.

Step 1:
990 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 990

Advancing to step 2:
990 can be fit into 87 0 times, resulting in a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Take the next digit (1) from the dividend and append it to 87, then repeat: 871 / 990

Advancing to step 3:
990 goes into 871 0 times with a remainder of 871.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 871 leaves us with 871.
Bring next digit (3) of the dividend behind the 871 and repeat the process: 8713 / 990

Going ahead to step 4:
990 goes into 8713 8 times with a remainder of 793.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 7920 away from 8713, we end up with 793.
Append the next digit (2) from the dividend to 793 and continue with: 7932 / 990

Advancing to step 5:
When dividing 7932 by 990, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 88.0
Subtracting 7920 from 7932 leaves us with 12.
Grab the next digit (2) from the dividend, add it to 12, then carry on: 122 / 990

On to step 6:
990 can be fit into 122 0 times, resulting in a remainder of 122.
Use 0 as the next digit of our solution. 
Result so far: 880.0
Deduct 0 from 122 and we're left with 122.
Append the next digit (2) from the dividend to 122 and continue with: 1222 / 990

Advancing to step 7:
If we divide 1222 by 990, we get 1 and a remainder of 232.
The next digit of our result is 1. 
Result so far: 8801.0
Subtract 990 from 1222 to get 232.
Append the next digit (5) from the dividend to 232 and continue with: 2325 / 990

Going ahead to step 8:
When dividing 2325 by 990, we get 2 with a remainder of 345.
Write down 2 as next digit of the result. 
Result so far: 88012.0
Subtracting 1980 from 2325 leaves us with 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

On to step 9:
3450 divided by 990 is 3 with a remainder of 480.
Record the quotient 3 as the next digit in the result. 
Result so far: 88012.3
Deduct 2970 from 3450 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Moving on to step 10:
The number 990 fits into 4800 4 times, leaving a remainder of 840.
The next digit of our result is 4. 
Result so far: 88012.34
Deduct 3960 from 4800 and we're left with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Advancing to step 11:
8400 divided by 990 is 8 with a remainder of 480.
Use 8 as the next digit of our solution. 
Result so far: 88012.348
Subtract 7920 from 8400 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 12:
990 can be fit into 4800 4 times, resulting in a remainder of 840.
Record the quotient 4 as the next digit in the result. 
Result so far: 88012.3484
Subtracting 3960 from 4800 leaves us with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Advancing to step 13:
8400 divided by 990 is 8 with a remainder of 480.
The number 8 becomes the next digit in our result. 
Result so far: 88012.34848
Deduct 7920 from 8400 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Moving on to step 14:
If we divide 4800 by 990, we get 4 and a remainder of 840.
The number 4 becomes the next digit in our result. 
Result so far: 88012.348484
Subtracting 3960 from 4800 leaves us with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Going ahead to step 15:
If we divide 8400 by 990, we get 8 and a remainder of 480.
The number 8 becomes the next digit in our result. 
Result so far: 88012.3484848
Deduct 7920 from 8400 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 16:
If we divide 4800 by 990, we get 4 and a remainder of 840.
Put 4 as the next digit of the answer. 
Result so far: 88012.34848484
Subtracting 3960 from 4800 leaves us with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

Our division results in 88012.34848484 with a remaining 8.4e-07.