637980 divided by 42 
The aim is to understand the frequency of 42 in 637980.

Moving on to step 1:
The number 42 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 42

Moving on to step 2:
The number 42 fits into 63 1 times, leaving a remainder of 21.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 21 after subtracting 42 from 63.
Take the next digit (7) from the dividend and append it to 21, then repeat: 217 / 42

Going ahead to step 3:
217 divided by 42 is 5 with a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 15.0
If we take 210 away from 217, we end up with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 42

Step 4:
The number 42 fits into 79 1 times, leaving a remainder of 37.
Write down 1 as next digit of the result. 
Result so far: 151.0
Deduct 42 from 79 and we're left with 37.
Take the next digit (8) from the dividend and append it to 37, then repeat: 378 / 42

Going ahead to step 5:
If we divide 378 by 42, we get 9 and a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 1519.0
Subtracting 378 from 378 leaves us with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 42

On to step 6:
42 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15190.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
42 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 15190.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
42 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 15190.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 15190.0 with a remainder of 0.0.