We divide 90897201 by 646
The aim is to understand the frequency of 646 in 90897201.

Advancing to step 1:
646 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 646

Moving on to step 2:
90 divided by 646 is 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 90 leaves us with 90.
Take the next digit (8) from the dividend and append it to 90, then repeat: 908 / 646

Let's proceed to step 3:
646 goes into 908 1 times with a remainder of 262.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 646 from 908, we get 262.
Include the next digit (9) from the dividend after 262, then repeat: 2629 / 646

Advancing to step 4:
When dividing 2629 by 646, we get 4 with a remainder of 45.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
If we subtract 2584 from 2629, we get 45.
Include the next digit (7) from the dividend after 45, then repeat: 457 / 646

Going ahead to step 5:
646 can be fit into 457 0 times, resulting in a remainder of 457.
Use 0 as the next digit of our solution. 
Result so far: 140.0
If we take 0 away from 457, we end up with 457.
Bring next digit (2) of the dividend behind the 457 and repeat the process: 4572 / 646

Let's proceed to step 6:
When dividing 4572 by 646, we get 7 with a remainder of 50.
Write down 7 as next digit of the result. 
Result so far: 1407.0
Subtracting 4522 from 4572 leaves us with 50.
Grab the next digit (0) from the dividend, add it to 50, then carry on: 500 / 646

Advancing to step 7:
The number 646 fits into 500 0 times, leaving a remainder of 500.
The next digit of our result is 0. 
Result so far: 14070.0
Deduct 0 from 500 and we're left with 500.
Include the next digit (1) from the dividend after 500, then repeat: 5001 / 646

Advancing to step 8:
The number 646 fits into 5001 7 times, leaving a remainder of 479.
Write down 7 as next digit of the result. 
Result so far: 140707.0
If we take 4522 away from 5001, we end up with 479.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

Moving on to step 9:
If we divide 4790 by 646, we get 7 and a remainder of 268.
Write down 7 as next digit of the result. 
Result so far: 140707.7
Subtracting 4522 from 4790 leaves us with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Let's proceed to step 10:
The number 646 fits into 2680 4 times, leaving a remainder of 96.
Record the quotient 4 as the next digit in the result. 
Result so far: 140707.74
Subtract 2584 from 2680 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 11:
When dividing 960 by 646, we get 1 with a remainder of 314.
The next digit of our result is 1. 
Result so far: 140707.741
If we take 646 away from 960, we end up with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Advancing to step 12:
If we divide 3140 by 646, we get 4 and a remainder of 556.
The number 4 becomes the next digit in our result. 
Result so far: 140707.7414
The remainder is 556 after subtracting 2584 from 3140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

On to step 13:
If we divide 5560 by 646, we get 8 and a remainder of 392.
Put 8 as the next digit of the answer. 
Result so far: 140707.74148
Subtract 5168 from 5560 to get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

On to step 14:
646 goes into 3920 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 140707.741486
The remainder is 44 after subtracting 3876 from 3920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 15:
When dividing 440 by 646, we get 0 with a remainder of 440.
The next digit of our result is 0. 
Result so far: 140707.741486
Deduct 0 from 440 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

On to step 16:
646 goes into 4400 6 times with a remainder of 524.
Use 6 as the next digit of our solution. 
Result so far: 140707.74148606
Subtract 3876 from 4400 to get 524.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

Our division results in 140707.74148606 with a remaining 5.24e-07.