We look at the division of 42943781 by 637 
The aim is to understand the frequency of 637 in 42943781.

Let's proceed to step 1:
4 divided by 637 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 637

Advancing to step 2:
If we divide 42 by 637, we get 0 and a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Grab the next digit (9) from the dividend, add it to 42, then carry on: 429 / 637

Let's proceed to step 3:
If we divide 429 by 637, we get 0 and a remainder of 429.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 429 to get 429.
Take the next digit (4) from the dividend and append it to 429, then repeat: 4294 / 637

Moving on to step 4:
4294 divided by 637 is 6 with a remainder of 472.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtracting 3822 from 4294 leaves us with 472.
Fetch the next digit (3) from the dividend, attach it to 472 and continue: 4723 / 637

Moving on to step 5:
637 can be fit into 4723 7 times, resulting in a remainder of 264.
Write down 7 as next digit of the result. 
Result so far: 67.0
Subtract 4459 from 4723 to get 264.
Grab the next digit (7) from the dividend, add it to 264, then carry on: 2647 / 637

Let's proceed to step 6:
637 goes into 2647 4 times with a remainder of 99.
Use 4 as the next digit of our solution. 
Result so far: 674.0
Deduct 2548 from 2647 and we're left with 99.
Include the next digit (8) from the dividend after 99, then repeat: 998 / 637

Going ahead to step 7:
637 goes into 998 1 times with a remainder of 361.
The number 1 becomes the next digit in our result. 
Result so far: 6741.0
Subtract 637 from 998 to get 361.
Grab the next digit (1) from the dividend, add it to 361, then carry on: 3611 / 637

Step 8:
The number 637 fits into 3611 5 times, leaving a remainder of 426.
The next digit of our result is 5. 
Result so far: 67415.0
If we subtract 3185 from 3611, we get 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

On to step 9:
If we divide 4260 by 637, we get 6 and a remainder of 438.
Put 6 as the next digit of the answer. 
Result so far: 67415.6
If we subtract 3822 from 4260, we get 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Step 10:
637 goes into 4380 6 times with a remainder of 558.
Record the quotient 6 as the next digit in the result. 
Result so far: 67415.66
Subtract 3822 from 4380 to get 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Our division results in 67415.66 with a remaining 0.558.