42298676 divided by 645 
The aim is to understand the frequency of 645 in 42298676.

On to step 1:
4 divided by 645 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 645

Advancing to step 2:
645 can be fit into 42 0 times, resulting in a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Bring next digit (2) of the dividend behind the 42 and repeat the process: 422 / 645

On to step 3:
When dividing 422 by 645, we get 0 with a remainder of 422.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 422 after subtracting 0 from 422.
Bring next digit (9) of the dividend behind the 422 and repeat the process: 4229 / 645

Step 4:
The number 645 fits into 4229 6 times, leaving a remainder of 359.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 3870 from 4229 and we're left with 359.
Include the next digit (8) from the dividend after 359, then repeat: 3598 / 645

On to step 5:
If we divide 3598 by 645, we get 5 and a remainder of 373.
Put 5 as the next digit of the answer. 
Result so far: 65.0
Deduct 3225 from 3598 and we're left with 373.
Take the next digit (6) from the dividend and append it to 373, then repeat: 3736 / 645

Going ahead to step 6:
If we divide 3736 by 645, we get 5 and a remainder of 511.
The next digit of our result is 5. 
Result so far: 655.0
If we subtract 3225 from 3736, we get 511.
Append the next digit (7) from the dividend to 511 and continue with: 5117 / 645

Let's proceed to step 7:
645 can be fit into 5117 7 times, resulting in a remainder of 602.
Put 7 as the next digit of the answer. 
Result so far: 6557.0
The remainder is 602 after subtracting 4515 from 5117.
Fetch the next digit (6) from the dividend, attach it to 602 and continue: 6026 / 645

Moving on to step 8:
If we divide 6026 by 645, we get 9 and a remainder of 221.
Put 9 as the next digit of the answer. 
Result so far: 65579.0
If we take 5805 away from 6026, we end up with 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

Step 9:
645 goes into 2210 3 times with a remainder of 275.
Write down 3 as next digit of the result. 
Result so far: 65579.3
If we subtract 1935 from 2210, we get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Moving on to step 10:
When dividing 2750 by 645, we get 4 with a remainder of 170.
Put 4 as the next digit of the answer. 
Result so far: 65579.34
If we take 2580 away from 2750, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 11:
645 goes into 1700 2 times with a remainder of 410.
Use 2 as the next digit of our solution. 
Result so far: 65579.342
If we subtract 1290 from 1700, we get 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Step 12:
645 can be fit into 4100 6 times, resulting in a remainder of 230.
Record the quotient 6 as the next digit in the result. 
Result so far: 65579.3426
If we subtract 3870 from 4100, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Advancing to step 13:
645 goes into 2300 3 times with a remainder of 365.
The next digit of our result is 3. 
Result so far: 65579.34263
Deduct 1935 from 2300 and we're left with 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Step 14:
645 goes into 3650 5 times with a remainder of 425.
The next digit of our result is 5. 
Result so far: 65579.342635
The remainder is 425 after subtracting 3225 from 3650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Step 15:
4250 divided by 645 is 6 with a remainder of 380.
The number 6 becomes the next digit in our result. 
Result so far: 65579.3426356
If we take 3870 away from 4250, we end up with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 16:
645 goes into 3800 5 times with a remainder of 575.
Write down 5 as next digit of the result. 
Result so far: 65579.34263565
If we take 3225 away from 3800, we end up with 575.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

The quotient of the division is 65579.34263565, and the remainder is 5.75e-07.