90912809 ÷ 486 
The aim is to understand the frequency of 486 in 90912809.

Advancing to step 1:
9 divided by 486 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 486

Moving on to step 2:
486 goes into 90 0 times with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Fetch the next digit (9) from the dividend, attach it to 90 and continue: 909 / 486

Moving on to step 3:
If we divide 909 by 486, we get 1 and a remainder of 423.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 486 from 909 leaves us with 423.
Grab the next digit (1) from the dividend, add it to 423, then carry on: 4231 / 486

Moving on to step 4:
486 can be fit into 4231 8 times, resulting in a remainder of 343.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
The remainder is 343 after subtracting 3888 from 4231.
Bring next digit (2) of the dividend behind the 343 and repeat the process: 3432 / 486

Step 5:
When dividing 3432 by 486, we get 7 with a remainder of 30.
Put 7 as the next digit of the answer. 
Result so far: 187.0
If we take 3402 away from 3432, we end up with 30.
Include the next digit (8) from the dividend after 30, then repeat: 308 / 486

Going ahead to step 6:
308 divided by 486 is 0 with a remainder of 308.
Put 0 as the next digit of the answer. 
Result so far: 1870.0
If we subtract 0 from 308, we get 308.
Grab the next digit (0) from the dividend, add it to 308, then carry on: 3080 / 486

Going ahead to step 7:
The number 486 fits into 3080 6 times, leaving a remainder of 164.
Write down 6 as next digit of the result. 
Result so far: 18706.0
Deduct 2916 from 3080 and we're left with 164.
Append the next digit (9) from the dividend to 164 and continue with: 1649 / 486

Moving on to step 8:
486 can be fit into 1649 3 times, resulting in a remainder of 191.
Use 3 as the next digit of our solution. 
Result so far: 187063.0
Subtract 1458 from 1649 to get 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

Advancing to step 9:
If we divide 1910 by 486, we get 3 and a remainder of 452.
Write down 3 as next digit of the result. 
Result so far: 187063.3
Subtracting 1458 from 1910 leaves us with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Going ahead to step 10:
486 goes into 4520 9 times with a remainder of 146.
Use 9 as the next digit of our solution. 
Result so far: 187063.39
If we subtract 4374 from 4520, we get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 11:
When dividing 1460 by 486, we get 3 with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 187063.393
The remainder is 2 after subtracting 1458 from 1460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
If we divide 20 by 486, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 187063.393
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
The number 486 fits into 200 0 times, leaving a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 187063.393
Subtract 0 from 200 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

After the division, we end up with 187063.393 and a remainder of 0.0002.