Let's divide 65378874 by 409
The aim is to understand the frequency of 409 in 65378874.

Moving on to step 1:
When dividing 6 by 409, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 409

Going ahead to step 2:
When dividing 65 by 409, we get 0 with a remainder of 65.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 65 leaves us with 65.
Grab the next digit (3) from the dividend, add it to 65, then carry on: 653 / 409

Step 3:
653 divided by 409 is 1 with a remainder of 244.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 244 after subtracting 409 from 653.
Fetch the next digit (7) from the dividend, attach it to 244 and continue: 2447 / 409

Moving on to step 4:
409 goes into 2447 5 times with a remainder of 402.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 2045 from 2447 and we're left with 402.
Append the next digit (8) from the dividend to 402 and continue with: 4028 / 409

Going ahead to step 5:
409 goes into 4028 9 times with a remainder of 347.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
The remainder is 347 after subtracting 3681 from 4028.
Take the next digit (8) from the dividend and append it to 347, then repeat: 3478 / 409

Going ahead to step 6:
409 goes into 3478 8 times with a remainder of 206.
Write down 8 as next digit of the result. 
Result so far: 1598.0
Subtracting 3272 from 3478 leaves us with 206.
Append the next digit (7) from the dividend to 206 and continue with: 2067 / 409

Moving on to step 7:
409 goes into 2067 5 times with a remainder of 22.
Put 5 as the next digit of the answer. 
Result so far: 15985.0
Subtracting 2045 from 2067 leaves us with 22.
Take the next digit (4) from the dividend and append it to 22, then repeat: 224 / 409

On to step 8:
If we divide 224 by 409, we get 0 and a remainder of 224.
The next digit of our result is 0. 
Result so far: 159850.0
Deduct 0 from 224 and we're left with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Advancing to step 9:
When dividing 2240 by 409, we get 5 with a remainder of 195.
Record the quotient 5 as the next digit in the result. 
Result so far: 159850.5
Deduct 2045 from 2240 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Going ahead to step 10:
If we divide 1950 by 409, we get 4 and a remainder of 314.
The number 4 becomes the next digit in our result. 
Result so far: 159850.54
The remainder is 314 after subtracting 1636 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 11:
409 can be fit into 3140 7 times, resulting in a remainder of 277.
The next digit of our result is 7. 
Result so far: 159850.547
Deduct 2863 from 3140 and we're left 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.

On to step 12:
2770 divided by 409 is 6 with a remainder of 316.
Use 6 as the next digit of our solution. 
Result so far: 159850.5476
If we take 2454 away from 2770, we end up with 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 13:
3160 divided by 409 is 7 with a remainder of 297.
Record the quotient 7 as the next digit in the result. 
Result so far: 159850.54767
Deduct 2863 from 3160 and we're left with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Moving on to step 14:
2970 divided by 409 is 7 with a remainder of 107.
The number 7 becomes the next digit in our result. 
Result so far: 159850.547677
Subtracting 2863 from 2970 leaves us with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

The final result is 159850.547677 with a remainder of 1.07e-05.