15607821 ÷ 554 
The aim is to understand the frequency of 554 in 15607821.

Let's proceed to step 1:
1 divided by 554 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 554

Let's proceed to step 2:
The number 554 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 554

Advancing to step 3:
554 can be fit into 156 0 times, resulting in a remainder of 156.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 156 after subtracting 0 from 156.
Grab the next digit (0) from the dividend, add it to 156, then carry on: 1560 / 554

Let's proceed to step 4:
554 can be fit into 1560 2 times, resulting in a remainder of 452.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1108 from 1560 leaves us with 452.
Append the next digit (7) from the dividend to 452 and continue with: 4527 / 554

On to step 5:
If we divide 4527 by 554, we get 8 and a remainder of 95.
Put 8 as the next digit of the answer. 
Result so far: 28.0
If we take 4432 away from 4527, we end up with 95.
Take the next digit (8) from the dividend and append it to 95, then repeat: 958 / 554

Step 6:
When dividing 958 by 554, we get 1 with a remainder of 404.
Write down 1 as next digit of the result. 
Result so far: 281.0
If we take 554 away from 958, we end up with 404.
Grab the next digit (2) from the dividend, add it to 404, then carry on: 4042 / 554

Advancing to step 7:
4042 divided by 554 is 7 with a remainder of 164.
Write down 7 as next digit of the result. 
Result so far: 2817.0
Deduct 3878 from 4042 and we're left with 164.
Append the next digit (1) from the dividend to 164 and continue with: 1641 / 554

Let's proceed to step 8:
When dividing 1641 by 554, we get 2 with a remainder of 533.
The number 2 becomes the next digit in our result. 
Result so far: 28172.0
Deduct 1108 from 1641 and we're left with 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

Moving on to step 9:
When dividing 5330 by 554, we get 9 with a remainder of 344.
The number 9 becomes the next digit in our result. 
Result so far: 28172.9
Subtracting 4986 from 5330 leaves us with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Going ahead to step 10:
554 goes into 3440 6 times with a remainder of 116.
The number 6 becomes the next digit in our result. 
Result so far: 28172.96
Deduct 3324 from 3440 and we're left 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.

Let's proceed to step 11:
1160 divided by 554 is 2 with a remainder of 52.
Use 2 as the next digit of our solution. 
Result so far: 28172.962
Deduct 1108 from 1160 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 12:
The number 554 fits into 520 0 times, leaving a remainder of 520.
Put 0 as the next digit of the answer. 
Result so far: 28172.962
If we take 0 away from 520, we end up with 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Going ahead to step 13:
When dividing 5200 by 554, we get 9 with a remainder of 214.
Use 9 as the next digit of our solution. 
Result so far: 28172.96209
Subtract 4986 from 5200 to get 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

On to step 14:
2140 divided by 554 is 3 with a remainder of 478.
Put 3 as the next digit of the answer. 
Result so far: 28172.962093
The remainder is 478 after subtracting 1662 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Advancing to step 15:
If we divide 4780 by 554, we get 8 and a remainder of 348.
Record the quotient 8 as the next digit in the result. 
Result so far: 28172.9620938
If we take 4432 away from 4780, we end up with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Step 16:
554 goes into 3480 6 times with a remainder of 156.
The next digit of our result is 6. 
Result so far: 28172.96209386
Subtracting 3324 from 3480 leaves us with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

After the division, we end up with 28172.96209386 and a remainder of 1.56e-07.