We're dividing 42446690 by 345 
The aim is to understand the frequency of 345 in 42446690.

On to step 1:
345 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 345

Advancing to step 2:
42 divided by 345 is 0 with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Take the next digit (4) from the dividend and append it to 42, then repeat: 424 / 345

Moving on to step 3:
345 can be fit into 424 1 times, resulting in a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 345 from 424 to get 79.
Include the next digit (4) from the dividend after 79, then repeat: 794 / 345

Let's proceed to step 4:
345 can be fit into 794 2 times, resulting in a remainder of 104.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Deduct 690 from 794 and we're left with 104.
Append the next digit (6) from the dividend to 104 and continue with: 1046 / 345

Advancing to step 5:
345 goes into 1046 3 times with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 123.0
If we subtract 1035 from 1046, we get 11.
Grab the next digit (6) from the dividend, add it to 11, then carry on: 116 / 345

Advancing to step 6:
When dividing 116 by 345, we get 0 with a remainder of 116.
Use 0 as the next digit of our solution. 
Result so far: 1230.0
The remainder is 116 after subtracting 0 from 116.
Take the next digit (9) from the dividend and append it to 116, then repeat: 1169 / 345

Let's proceed to step 7:
The number 345 fits into 1169 3 times, leaving a remainder of 134.
Record the quotient 3 as the next digit in the result. 
Result so far: 12303.0
If we subtract 1035 from 1169, we get 134.
Grab the next digit (0) from the dividend, add it to 134, then carry on: 1340 / 345

Going ahead to step 8:
The number 345 fits into 1340 3 times, leaving a remainder of 305.
The number 3 becomes the next digit in our result. 
Result so far: 123033.0
If we subtract 1035 from 1340, we get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

On to step 9:
3050 divided by 345 is 8 with a remainder of 290.
The number 8 becomes the next digit in our result. 
Result so far: 123033.8
Deduct 2760 from 3050 and we're left with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Going ahead to step 10:
When dividing 2900 by 345, we get 8 with a remainder of 140.
The next digit of our result is 8. 
Result so far: 123033.88
If we take 2760 away from 2900, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final outcome is 123033.88, with a leftover of 0.14.