74213118 divided by 646 
The aim is to understand the frequency of 646 in 74213118.

On to step 1:
If we divide 7 by 646, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (4) from the dividend after 7, then repeat: 74 / 646

Moving on to step 2:
74 divided by 646 is 0 with a remainder of 74.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 74, we end up with 74.
Fetch the next digit (2) from the dividend, attach it to 74 and continue: 742 / 646

Let's proceed to step 3:
When dividing 742 by 646, we get 1 with a remainder of 96.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 96 after subtracting 646 from 742.
Include the next digit (1) from the dividend after 96, then repeat: 961 / 646

Moving on to step 4:
961 divided by 646 is 1 with a remainder of 315.
Write down 1 as next digit of the result. 
Result so far: 11.0
Subtracting 646 from 961 leaves us with 315.
Fetch the next digit (3) from the dividend, attach it to 315 and continue: 3153 / 646

Going ahead to step 5:
646 can be fit into 3153 4 times, resulting in a remainder of 569.
Write down 4 as next digit of the result. 
Result so far: 114.0
If we subtract 2584 from 3153, we get 569.
Take the next digit (1) from the dividend and append it to 569, then repeat: 5691 / 646

Advancing to step 6:
646 goes into 5691 8 times with a remainder of 523.
The next digit of our result is 8. 
Result so far: 1148.0
Subtracting 5168 from 5691 leaves us with 523.
Grab the next digit (1) from the dividend, add it to 523, then carry on: 5231 / 646

Advancing to step 7:
646 goes into 5231 8 times with a remainder of 63.
Use 8 as the next digit of our solution. 
Result so far: 11488.0
The remainder is 63 after subtracting 5168 from 5231.
Bring next digit (8) of the dividend behind the 63 and repeat the process: 638 / 646

Let's proceed to step 8:
If we divide 638 by 646, we get 0 and a remainder of 638.
Record the quotient 0 as the next digit in the result. 
Result so far: 114880.0
Subtracting 0 from 638 leaves us with 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Moving on to step 9:
The number 646 fits into 6380 9 times, leaving a remainder of 566.
Record the quotient 9 as the next digit in the result. 
Result so far: 114880.9
If we subtract 5814 from 6380, we get 566.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5660, and continue the process.

Moving on to step 10:
5660 divided by 646 is 8 with a remainder of 492.
Record the quotient 8 as the next digit in the result. 
Result so far: 114880.98
If we subtract 5168 from 5660, we get 492.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

On to step 11:
The number 646 fits into 4920 7 times, leaving a remainder of 398.
Use 7 as the next digit of our solution. 
Result so far: 114880.987
Subtract 4522 from 4920 to get 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

On to step 12:
The number 646 fits into 3980 6 times, leaving a remainder of 104.
Put 6 as the next digit of the answer. 
Result so far: 114880.9876
The remainder is 104 after subtracting 3876 from 3980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Let's proceed to step 13:
When dividing 1040 by 646, we get 1 with a remainder of 394.
The next digit of our result is 1. 
Result so far: 114880.98761
Subtracting 646 from 1040 leaves us with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Let's proceed to step 14:
646 goes into 3940 6 times with a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 114880.987616
The remainder is 64 after subtracting 3876 from 3940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 15:
The number 646 fits into 640 0 times, leaving a remainder of 640.
Use 0 as the next digit of our solution. 
Result so far: 114880.987616
If we take 0 away from 640, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Going ahead to step 16:
When dividing 6400 by 646, we get 9 with a remainder of 586.
Put 9 as the next digit of the answer. 
Result so far: 114880.98761609
Subtract 5814 from 6400 to get 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

The quotient of the division is 114880.98761609, and the remainder is 5.86e-07.