712853 divided by 42 
The aim is to understand the frequency of 42 in 712853.

Let's proceed to step 1:
If we divide 7 by 42, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 42

On to step 2:
The number 42 fits into 71 1 times, leaving a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 42 away from 71, we end up with 29.
Take the next digit (2) from the dividend and append it to 29, then repeat: 292 / 42

Step 3:
If we divide 292 by 42, we get 6 and a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we take 252 away from 292, we end up with 40.
Grab the next digit (8) from the dividend, add it to 40, then carry on: 408 / 42

Step 4:
When dividing 408 by 42, we get 9 with a remainder of 30.
Record the quotient 9 as the next digit in the result. 
Result so far: 169.0
Deduct 378 from 408 and we're left with 30.
Grab the next digit (5) from the dividend, add it to 30, then carry on: 305 / 42

On to step 5:
42 goes into 305 7 times with a remainder of 11.
Use 7 as the next digit of our solution. 
Result so far: 1697.0
Subtract 294 from 305 to get 11.
Take the next digit (3) from the dividend and append it to 11, then repeat: 113 / 42

On to step 6:
42 can be fit into 113 2 times, resulting in a remainder of 29.
Put 2 as the next digit of the answer. 
Result so far: 16972.0
Subtracting 84 from 113 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 7:
The number 42 fits into 290 6 times, leaving a remainder of 38.
The number 6 becomes the next digit in our result. 
Result so far: 16972.6
The remainder is 38 after subtracting 252 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 8:
42 goes into 380 9 times with a remainder of 2.
The next digit of our result is 9. 
Result so far: 16972.69
Subtract 378 from 380 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 9:
42 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 16972.69
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
When dividing 200 by 42, we get 4 with a remainder of 32.
Write down 4 as next digit of the result. 
Result so far: 16972.6904
The remainder is 32 after subtracting 168 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 11:
If we divide 320 by 42, we get 7 and a remainder of 26.
Use 7 as the next digit of our solution. 
Result so far: 16972.69047
The remainder is 26 after subtracting 294 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 12:
42 goes into 260 6 times with a remainder of 8.
The next digit of our result is 6. 
Result so far: 16972.690476
The remainder is 8 after subtracting 252 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 13:
If we divide 80 by 42, we get 1 and a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 16972.6904761
Subtracting 42 from 80 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 14:
If we divide 380 by 42, we get 9 and a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 16972.69047619
Deduct 378 from 380 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 16972.69047619, with a leftover of 2e-09.