42920990 ÷ 663 
The aim is to understand the frequency of 663 in 42920990.

Step 1:
The number 663 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 663

Step 2:
663 goes into 42 0 times with a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Append the next digit (9) from the dividend to 42 and continue with: 429 / 663

Step 3:
If we divide 429 by 663, we get 0 and a remainder of 429.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 429, we get 429.
Fetch the next digit (2) from the dividend, attach it to 429 and continue: 4292 / 663

Let's proceed to step 4:
663 can be fit into 4292 6 times, resulting in a remainder of 314.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 3978 from 4292 and we're left with 314.
Append the next digit (0) from the dividend to 314 and continue with: 3140 / 663

Step 5:
3140 divided by 663 is 4 with a remainder of 488.
Record the quotient 4 as the next digit in the result. 
Result so far: 64.0
If we subtract 2652 from 3140, we get 488.
Bring next digit (9) of the dividend behind the 488 and repeat the process: 4889 / 663

Advancing to step 6:
4889 divided by 663 is 7 with a remainder of 248.
Put 7 as the next digit of the answer. 
Result so far: 647.0
If we subtract 4641 from 4889, we get 248.
Include the next digit (9) from the dividend after 248, then repeat: 2489 / 663

Moving on to step 7:
When dividing 2489 by 663, we get 3 with a remainder of 500.
The number 3 becomes the next digit in our result. 
Result so far: 6473.0
Subtract 1989 from 2489 to get 500.
Fetch the next digit (0) from the dividend, attach it to 500 and continue: 5000 / 663

Step 8:
5000 divided by 663 is 7 with a remainder of 359.
Write down 7 as next digit of the result. 
Result so far: 64737.0
If we subtract 4641 from 5000, we get 359.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3590, and continue the process.

Step 9:
The number 663 fits into 3590 5 times, leaving a remainder of 275.
Write down 5 as next digit of the result. 
Result so far: 64737.5
The remainder is 275 after subtracting 3315 from 3590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

On to step 10:
If we divide 2750 by 663, we get 4 and a remainder of 98.
Write down 4 as next digit of the result. 
Result so far: 64737.54
If we take 2652 away from 2750, we end up with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Going ahead to step 11:
663 goes into 980 1 times with a remainder of 317.
The number 1 becomes the next digit in our result. 
Result so far: 64737.541
The remainder is 317 after subtracting 663 from 980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Advancing to step 12:
3170 divided by 663 is 4 with a remainder of 518.
The next digit of our result is 4. 
Result so far: 64737.5414
If we take 2652 away from 3170, we end up with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Going ahead to step 13:
If we divide 5180 by 663, we get 7 and a remainder of 539.
Use 7 as the next digit of our solution. 
Result so far: 64737.54147
Subtracting 4641 from 5180 leaves us with 539.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5390, and continue the process.

On to step 14:
The number 663 fits into 5390 8 times, leaving a remainder of 86.
Put 8 as the next digit of the answer. 
Result so far: 64737.541478
Subtract 5304 from 5390 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 15:
When dividing 860 by 663, we get 1 with a remainder of 197.
Write down 1 as next digit of the result. 
Result so far: 64737.5414781
The remainder is 197 after subtracting 663 from 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Going ahead to step 16:
If we divide 1970 by 663, we get 2 and a remainder of 644.
The next digit of our result is 2. 
Result so far: 64737.54147812
If we take 1326 away from 1970, we end up with 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

The final outcome is 64737.54147812, with a leftover of 6.44e-07.