We're dividing 43246126 by 644 
The aim is to understand the frequency of 644 in 43246126.

Step 1:
644 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 644

Step 2:
When dividing 43 by 644, we get 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 43 after subtracting 0 from 43.
Fetch the next digit (2) from the dividend, attach it to 43 and continue: 432 / 644

On to step 3:
The number 644 fits into 432 0 times, leaving a remainder of 432.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 432 and we're left with 432.
Include the next digit (4) from the dividend after 432, then repeat: 4324 / 644

Moving on to step 4:
644 can be fit into 4324 6 times, resulting in a remainder of 460.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 3864 from 4324 leaves us with 460.
Include the next digit (6) from the dividend after 460, then repeat: 4606 / 644

Step 5:
If we divide 4606 by 644, we get 7 and a remainder of 98.
Record the quotient 7 as the next digit in the result. 
Result so far: 67.0
The remainder is 98 after subtracting 4508 from 4606.
Append the next digit (1) from the dividend to 98 and continue with: 981 / 644

On to step 6:
If we divide 981 by 644, we get 1 and a remainder of 337.
The next digit of our result is 1. 
Result so far: 671.0
Subtracting 644 from 981 leaves us with 337.
Bring next digit (2) of the dividend behind the 337 and repeat the process: 3372 / 644

Let's proceed to step 7:
The number 644 fits into 3372 5 times, leaving a remainder of 152.
Write down 5 as next digit of the result. 
Result so far: 6715.0
The remainder is 152 after subtracting 3220 from 3372.
Grab the next digit (6) from the dividend, add it to 152, then carry on: 1526 / 644

Let's proceed to step 8:
644 can be fit into 1526 2 times, resulting in a remainder of 238.
Use 2 as the next digit of our solution. 
Result so far: 67152.0
If we subtract 1288 from 1526, we get 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

On to step 9:
When dividing 2380 by 644, we get 3 with a remainder of 448.
Put 3 as the next digit of the answer. 
Result so far: 67152.3
The remainder is 448 after subtracting 1932 from 2380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Going ahead to step 10:
4480 divided by 644 is 6 with a remainder of 616.
The next digit of our result is 6. 
Result so far: 67152.36
If we take 3864 away from 4480, we end up with 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

Advancing to step 11:
When dividing 6160 by 644, we get 9 with a remainder of 364.
Record the quotient 9 as the next digit in the result. 
Result so far: 67152.369
Deduct 5796 from 6160 and we're left with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Going ahead to step 12:
The number 644 fits into 3640 5 times, leaving a remainder of 420.
Write down 5 as next digit of the result. 
Result so far: 67152.3695
Deduct 3220 from 3640 and we're left with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Moving on to step 13:
644 can be fit into 4200 6 times, resulting in a remainder of 336.
Write down 6 as next digit of the result. 
Result so far: 67152.36956
Deduct 3864 from 4200 and we're left with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Going ahead to step 14:
If we divide 3360 by 644, we get 5 and a remainder of 140.
The number 5 becomes the next digit in our result. 
Result so far: 67152.369565
Deduct 3220 from 3360 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 15:
When dividing 1400 by 644, we get 2 with a remainder of 112.
The number 2 becomes the next digit in our result. 
Result so far: 67152.3695652
If we take 1288 away from 1400, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 16:
644 can be fit into 1120 1 times, resulting in a remainder of 476.
The next digit of our result is 1. 
Result so far: 67152.36956521
Subtracting 644 from 1120 leaves us with 476.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

After the division, we end up with 67152.36956521 and a remainder of 4.76e-07.