We look at the division of 9902915 by 401 
The aim is to understand the frequency of 401 in 9902915.

Step 1:
401 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 401

Moving on to step 2:
401 can be fit into 99 0 times, resulting in a remainder of 99.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Include the next digit (0) from the dividend after 99, then repeat: 990 / 401

Advancing to step 3:
990 divided by 401 is 2 with a remainder of 188.
The next digit of our result is 2. 
Result so far: 2.0
If we take 802 away from 990, we end up with 188.
Include the next digit (2) from the dividend after 188, then repeat: 1882 / 401

Step 4:
The number 401 fits into 1882 4 times, leaving a remainder of 278.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Subtract 1604 from 1882 to get 278.
Fetch the next digit (9) from the dividend, attach it to 278 and continue: 2789 / 401

Step 5:
When dividing 2789 by 401, we get 6 with a remainder of 383.
The number 6 becomes the next digit in our result. 
Result so far: 246.0
Subtracting 2406 from 2789 leaves us with 383.
Fetch the next digit (1) from the dividend, attach it to 383 and continue: 3831 / 401

Going ahead to step 6:
401 can be fit into 3831 9 times, resulting in a remainder of 222.
Use 9 as the next digit of our solution. 
Result so far: 2469.0
The remainder is 222 after subtracting 3609 from 3831.
Append the next digit (5) from the dividend to 222 and continue with: 2225 / 401

On to step 7:
When dividing 2225 by 401, we get 5 with a remainder of 220.
Put 5 as the next digit of the answer. 
Result so far: 24695.0
If we take 2005 away from 2225, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

On to step 8:
The number 401 fits into 2200 5 times, leaving a remainder of 195.
The next digit of our result is 5. 
Result so far: 24695.5
If we subtract 2005 from 2200, we get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Let's proceed to step 9:
401 goes into 1950 4 times with a remainder of 346.
Record the quotient 4 as the next digit in the result. 
Result so far: 24695.54
The remainder is 346 after subtracting 1604 from 1950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Moving on to step 10:
401 goes into 3460 8 times with a remainder of 252.
The next digit of our result is 8. 
Result so far: 24695.548
Subtracting 3208 from 3460 leaves us with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Let's proceed to step 11:
If we divide 2520 by 401, we get 6 and a remainder of 114.
The next digit of our result is 6. 
Result so far: 24695.5486
Subtracting 2406 from 2520 leaves us with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Going ahead to step 12:
1140 divided by 401 is 2 with a remainder of 338.
The next digit of our result is 2. 
Result so far: 24695.54862
Subtract 802 from 1140 to get 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Step 13:
When dividing 3380 by 401, we get 8 with a remainder of 172.
Use 8 as the next digit of our solution. 
Result so far: 24695.548628
If we take 3208 away from 3380, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Step 14:
If we divide 1720 by 401, we get 4 and a remainder of 116.
Use 4 as the next digit of our solution. 
Result so far: 24695.5486284
Subtracting 1604 from 1720 leaves us 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.

Moving on to step 15:
When dividing 1160 by 401, we get 2 with a remainder of 358.
The number 2 becomes the next digit in our result. 
Result so far: 24695.54862842
If we take 802 away from 1160, we end up with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Our division results in 24695.54862842 with a remaining 3.58e-07.