Let's divide 3934410 by 398
The aim is to understand the frequency of 398 in 3934410.

Step 1:
398 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 398

Moving on to step 2:
If we divide 39 by 398, we get 0 and a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Append the next digit (3) from the dividend to 39 and continue with: 393 / 398

Going ahead to step 3:
398 goes into 393 0 times with a remainder of 393.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 393, we end up with 393.
Append the next digit (4) from the dividend to 393 and continue with: 3934 / 398

Moving on to step 4:
398 goes into 3934 9 times with a remainder of 352.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 3582 from 3934 to get 352.
Take the next digit (4) from the dividend and append it to 352, then repeat: 3524 / 398

Step 5:
If we divide 3524 by 398, we get 8 and a remainder of 340.
Put 8 as the next digit of the answer. 
Result so far: 98.0
Subtract 3184 from 3524 to get 340.
Grab the next digit (1) from the dividend, add it to 340, then carry on: 3401 / 398

Let's proceed to step 6:
When dividing 3401 by 398, we get 8 with a remainder of 217.
Use 8 as the next digit of our solution. 
Result so far: 988.0
If we take 3184 away from 3401, we end up with 217.
Include the next digit (0) from the dividend after 217, then repeat: 2170 / 398

Let's proceed to step 7:
398 goes into 2170 5 times with a remainder of 180.
Record the quotient 5 as the next digit in the result. 
Result so far: 9885.0
Subtracting 1990 from 2170 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 8:
If we divide 1800 by 398, we get 4 and a remainder of 208.
Put 4 as the next digit of the answer. 
Result so far: 9885.4
The remainder is 208 after subtracting 1592 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Step 9:
If we divide 2080 by 398, we get 5 and a remainder of 90.
Put 5 as the next digit of the answer. 
Result so far: 9885.45
Deduct 1990 from 2080 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 10:
900 divided by 398 is 2 with a remainder of 104.
Write down 2 as next digit of the result. 
Result so far: 9885.452
Deduct 796 from 900 and we're left with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Advancing to step 11:
1040 divided by 398 is 2 with a remainder of 244.
Put 2 as the next digit of the answer. 
Result so far: 9885.4522
Deduct 796 from 1040 and we're left with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

The quotient of the division is 9885.4522, and the remainder is 0.00244.