90845078 divided by 351 
The aim is to understand the frequency of 351 in 90845078.

Moving on to step 1:
9 divided by 351 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 351

Let's proceed to step 2:
If we divide 90 by 351, we get 0 and a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Bring next digit (8) of the dividend behind the 90 and repeat the process: 908 / 351

On to step 3:
The number 351 fits into 908 2 times, leaving a remainder of 206.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 206 after subtracting 702 from 908.
Take the next digit (4) from the dividend and append it to 206, then repeat: 2064 / 351

Step 4:
If we divide 2064 by 351, we get 5 and a remainder of 309.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 1755 from 2064 to get 309.
Fetch the next digit (5) from the dividend, attach it to 309 and continue: 3095 / 351

Advancing to step 5:
The number 351 fits into 3095 8 times, leaving a remainder of 287.
The next digit of our result is 8. 
Result so far: 258.0
If we subtract 2808 from 3095, we get 287.
Fetch the next digit (0) from the dividend, attach it to 287 and continue: 2870 / 351

On to step 6:
2870 divided by 351 is 8 with a remainder of 62.
The next digit of our result is 8. 
Result so far: 2588.0
If we take 2808 away from 2870, we end up with 62.
Grab the next digit (7) from the dividend, add it to 62, then carry on: 627 / 351

On to step 7:
351 can be fit into 627 1 times, resulting in a remainder of 276.
Write down 1 as next digit of the result. 
Result so far: 25881.0
Subtract 351 from 627 to get 276.
Include the next digit (8) from the dividend after 276, then repeat: 2768 / 351

Going ahead to step 8:
351 goes into 2768 7 times with a remainder of 311.
Write down 7 as next digit of the result. 
Result so far: 258817.0
Subtracting 2457 from 2768 leaves us with 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Advancing to step 9:
351 goes into 3110 8 times with a remainder of 302.
Record the quotient 8 as the next digit in the result. 
Result so far: 258817.8
The remainder is 302 after subtracting 2808 from 3110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

On to step 10:
351 can be fit into 3020 8 times, resulting in a remainder of 212.
Write down 8 as next digit of the result. 
Result so far: 258817.88
If we take 2808 away from 3020, we end up with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

The quotient of the division is 258817.88, and the remainder is 0.212.