990341 ÷ 405 
The aim is to understand the frequency of 405 in 990341.

Going ahead to step 1:
If we divide 9 by 405, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 405

Going ahead to step 2:
405 can be fit into 99 0 times, resulting in a remainder of 99.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Fetch the next digit (0) from the dividend, attach it to 99 and continue: 990 / 405

Going ahead to step 3:
When dividing 990 by 405, we get 2 with a remainder of 180.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 810 from 990 to get 180.
Grab the next digit (3) from the dividend, add it to 180, then carry on: 1803 / 405

Advancing to step 4:
When dividing 1803 by 405, we get 4 with a remainder of 183.
Put 4 as the next digit of the answer. 
Result so far: 24.0
If we subtract 1620 from 1803, we get 183.
Append the next digit (4) from the dividend to 183 and continue with: 1834 / 405

Step 5:
If we divide 1834 by 405, we get 4 and a remainder of 214.
Write down 4 as next digit of the result. 
Result so far: 244.0
Subtract 1620 from 1834 to get 214.
Bring next digit (1) of the dividend behind the 214 and repeat the process: 2141 / 405

Step 6:
2141 divided by 405 is 5 with a remainder of 116.
Put 5 as the next digit of the answer. 
Result so far: 2445.0
If we take 2025 away from 2141, we end up with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 7:
405 can be fit into 1160 2 times, resulting in a remainder of 350.
The number 2 becomes the next digit in our result. 
Result so far: 2445.2
Deduct 810 from 1160 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Advancing to step 8:
3500 divided by 405 is 8 with a remainder of 260.
Record the quotient 8 as the next digit in the result. 
Result so far: 2445.28
Subtracting 3240 from 3500 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 9:
405 goes into 2600 6 times with a remainder of 170.
The number 6 becomes the next digit in our result. 
Result so far: 2445.286
Subtracting 2430 from 2600 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 10:
When dividing 1700 by 405, we get 4 with a remainder of 80.
Write down 4 as next digit of the result. 
Result so far: 2445.2864
Subtract 1620 from 1700 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 11:
405 goes into 800 1 times with a remainder of 395.
Record the quotient 1 as the next digit in the result. 
Result so far: 2445.28641
Deduct 405 from 800 and we're left with 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

On to step 12:
The number 405 fits into 3950 9 times, leaving a remainder of 305.
Record the quotient 9 as the next digit in the result. 
Result so far: 2445.286419
Subtracting 3645 from 3950 leaves us with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Moving on to step 13:
If we divide 3050 by 405, we get 7 and a remainder of 215.
The number 7 becomes the next digit in our result. 
Result so far: 2445.2864197
If we take 2835 away from 3050, we end up with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Moving on to step 14:
If we divide 2150 by 405, we get 5 and a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 2445.28641975
Deduct 2025 from 2150 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

The quotient of the division is 2445.28641975, and the remainder is 1.25e-07.