We look at the division of 43240890 by 354 
The aim is to understand the frequency of 354 in 43240890.

Step 1:
4 divided by 354 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 354

Moving on to step 2:
The number 354 fits into 43 0 times, leaving a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 43 and we're left with 43.
Append the next digit (2) from the dividend to 43 and continue with: 432 / 354

Advancing to step 3:
354 can be fit into 432 1 times, resulting in a remainder of 78.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 354 from 432 and we're left with 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 354

On to step 4:
354 goes into 784 2 times with a remainder of 76.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 76 after subtracting 708 from 784.
Grab the next digit (0) from the dividend, add it to 76, then carry on: 760 / 354

On to step 5:
When dividing 760 by 354, we get 2 with a remainder of 52.
Use 2 as the next digit of our solution. 
Result so far: 122.0
Deduct 708 from 760 and we're left with 52.
Include the next digit (8) from the dividend after 52, then repeat: 528 / 354

Going ahead to step 6:
If we divide 528 by 354, we get 1 and a remainder of 174.
Put 1 as the next digit of the answer. 
Result so far: 1221.0
Subtracting 354 from 528 leaves us with 174.
Append the next digit (9) from the dividend to 174 and continue with: 1749 / 354

Moving on to step 7:
If we divide 1749 by 354, we get 4 and a remainder of 333.
Write down 4 as next digit of the result. 
Result so far: 12214.0
Subtract 1416 from 1749 to get 333.
Take the next digit (0) from the dividend and append it to 333, then repeat: 3330 / 354

On to step 8:
The number 354 fits into 3330 9 times, leaving a remainder of 144.
Record the quotient 9 as the next digit in the result. 
Result so far: 122149.0
Subtracting 3186 from 3330 leaves us with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

On to step 9:
354 goes into 1440 4 times with a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 122149.4
If we take 1416 away from 1440, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 10:
354 goes into 240 0 times with a remainder of 240.
Record the quotient 0 as the next digit in the result. 
Result so far: 122149.4
Subtracting 0 from 240 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 11:
2400 divided by 354 is 6 with a remainder of 276.
Use 6 as the next digit of our solution. 
Result so far: 122149.406
Subtract 2124 from 2400 to get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Going ahead to step 12:
When dividing 2760 by 354, we get 7 with a remainder of 282.
The number 7 becomes the next digit in our result. 
Result so far: 122149.4067
Subtract 2478 from 2760 to get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 13:
354 goes into 2820 7 times with a remainder of 342.
Write down 7 as next digit of the result. 
Result so far: 122149.40677
Subtracting 2478 from 2820 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

The final outcome is 122149.40677, with a leftover of 0.000342.