56665421 ÷ 354 
The aim is to understand the frequency of 354 in 56665421.

Let's proceed to step 1:
5 divided by 354 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 354

Step 2:
56 divided by 354 is 0 with a remainder of 56.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 56 after subtracting 0 from 56.
Bring next digit (6) of the dividend behind the 56 and repeat the process: 566 / 354

Moving on to step 3:
354 goes into 566 1 times with a remainder of 212.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 354 away from 566, we end up with 212.
Append the next digit (6) from the dividend to 212 and continue with: 2126 / 354

Advancing to step 4:
The number 354 fits into 2126 6 times, leaving a remainder of 2.
The next digit of our result is 6. 
Result so far: 16.0
Subtracting 2124 from 2126 leaves us with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 354

Advancing to step 5:
If we divide 25 by 354, we get 0 and a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 160.0
Deduct 0 from 25 and we're left with 25.
Bring next digit (4) of the dividend behind the 25 and repeat the process: 254 / 354

Moving on to step 6:
If we divide 254 by 354, we get 0 and a remainder of 254.
Record the quotient 0 as the next digit in the result. 
Result so far: 1600.0
If we subtract 0 from 254, we get 254.
Include the next digit (2) from the dividend after 254, then repeat: 2542 / 354

Step 7:
The number 354 fits into 2542 7 times, leaving a remainder of 64.
The next digit of our result is 7. 
Result so far: 16007.0
If we subtract 2478 from 2542, we get 64.
Include the next digit (1) from the dividend after 64, then repeat: 641 / 354

Step 8:
354 can be fit into 641 1 times, resulting in a remainder of 287.
The next digit of our result is 1. 
Result so far: 160071.0
If we subtract 354 from 641, we get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Let's proceed to step 9:
When dividing 2870 by 354, we get 8 with a remainder of 38.
Record the quotient 8 as the next digit in the result. 
Result so far: 160071.8
Deduct 2832 from 2870 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 10:
354 goes into 380 1 times with a remainder of 26.
Write down 1 as next digit of the result. 
Result so far: 160071.81
If we subtract 354 from 380, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 11:
260 divided by 354 is 0 with a remainder of 260.
Write down 0 as next digit of the result. 
Result so far: 160071.81
Subtracting 0 from 260 leaves us 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.

Advancing to step 12:
If we divide 2600 by 354, we get 7 and a remainder of 122.
The next digit of our result is 7. 
Result so far: 160071.8107
The remainder is 122 after subtracting 2478 from 2600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Let's proceed to step 13:
354 goes into 1220 3 times with a remainder of 158.
Use 3 as the next digit of our solution. 
Result so far: 160071.81073
Subtract 1062 from 1220 to get 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Moving on to step 14:
1580 divided by 354 is 4 with a remainder of 164.
Record the quotient 4 as the next digit in the result. 
Result so far: 160071.810734
If we take 1416 away from 1580, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

On to step 15:
354 goes into 1640 4 times with a remainder of 224.
Record the quotient 4 as the next digit in the result. 
Result so far: 160071.8107344
If we subtract 1416 from 1640, we get 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Our division results in 160071.8107344 with a remaining 2.24e-06.