We look at the division of 15222997 by 428 
The aim is to understand the frequency of 428 in 15222997.

On to step 1:
428 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 428

Let's proceed to step 2:
When dividing 15 by 428, we get 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Bring next digit (2) of the dividend behind the 15 and repeat the process: 152 / 428

Advancing to step 3:
152 divided by 428 is 0 with a remainder of 152.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 152 after subtracting 0 from 152.
Include the next digit (2) from the dividend after 152, then repeat: 1522 / 428

On to step 4:
428 can be fit into 1522 3 times, resulting in a remainder of 238.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 1284 from 1522, we get 238.
Fetch the next digit (2) from the dividend, attach it to 238 and continue: 2382 / 428

Let's proceed to step 5:
428 goes into 2382 5 times with a remainder of 242.
Write down 5 as next digit of the result. 
Result so far: 35.0
Deduct 2140 from 2382 and we're left with 242.
Grab the next digit (9) from the dividend, add it to 242, then carry on: 2429 / 428

Step 6:
If we divide 2429 by 428, we get 5 and a remainder of 289.
Record the quotient 5 as the next digit in the result. 
Result so far: 355.0
The remainder is 289 after subtracting 2140 from 2429.
Include the next digit (9) from the dividend after 289, then repeat: 2899 / 428

Going ahead to step 7:
2899 divided by 428 is 6 with a remainder of 331.
Write down 6 as next digit of the result. 
Result so far: 3556.0
Deduct 2568 from 2899 and we're left with 331.
Take the next digit (7) from the dividend and append it to 331, then repeat: 3317 / 428

Moving on to step 8:
When dividing 3317 by 428, we get 7 with a remainder of 321.
The number 7 becomes the next digit in our result. 
Result so far: 35567.0
Subtracting 2996 from 3317 leaves us with 321.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Advancing to step 9:
428 goes into 3210 7 times with a remainder of 214.
Put 7 as the next digit of the answer. 
Result so far: 35567.7
Subtracting 2996 from 3210 leaves us with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Going ahead to step 10:
If we divide 2140 by 428, we get 5 and a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 35567.75
Subtract 2140 from 2140 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
When dividing 0 by 428, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 35567.75
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
428 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 35567.75
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 35567.75, and the remainder is 0.0.