We divide 12553906 by 428
The aim is to understand the frequency of 428 in 12553906.

Step 1:
If we divide 1 by 428, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 428

Let's proceed to step 2:
If we divide 12 by 428, we get 0 and a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (5) from the dividend to 12 and continue with: 125 / 428

On to step 3:
When dividing 125 by 428, we get 0 with a remainder of 125.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 125 to get 125.
Take the next digit (5) from the dividend and append it to 125, then repeat: 1255 / 428

On to step 4:
If we divide 1255 by 428, we get 2 and a remainder of 399.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 856 away from 1255, we end up with 399.
Include the next digit (3) from the dividend after 399, then repeat: 3993 / 428

Step 5:
428 goes into 3993 9 times with a remainder of 141.
Put 9 as the next digit of the answer. 
Result so far: 29.0
The remainder is 141 after subtracting 3852 from 3993.
Fetch the next digit (9) from the dividend, attach it to 141 and continue: 1419 / 428

Step 6:
1419 divided by 428 is 3 with a remainder of 135.
Put 3 as the next digit of the answer. 
Result so far: 293.0
If we take 1284 away from 1419, we end up with 135.
Include the next digit (0) from the dividend after 135, then repeat: 1350 / 428

Moving on to step 7:
The number 428 fits into 1350 3 times, leaving a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 2933.0
Subtracting 1284 from 1350 leaves us with 66.
Append the next digit (6) from the dividend to 66 and continue with: 666 / 428

Let's proceed to step 8:
If we divide 666 by 428, we get 1 and a remainder of 238.
The number 1 becomes the next digit in our result. 
Result so far: 29331.0
Subtracting 428 from 666 leaves us with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Moving on to step 9:
When dividing 2380 by 428, we get 5 with a remainder of 240.
Use 5 as the next digit of our solution. 
Result so far: 29331.5
Subtract 2140 from 2380 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 10:
428 goes into 2400 5 times with a remainder of 260.
Put 5 as the next digit of the answer. 
Result so far: 29331.55
Deduct 2140 from 2400 and we're left 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.

The quotient of the division is 29331.55, and the remainder is 0.26.