32574638 divided by 644 
The aim is to understand the frequency of 644 in 32574638.

Advancing to step 1:
3 divided by 644 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 644

On to step 2:
32 divided by 644 is 0 with a remainder of 32.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 32, we end up with 32.
Grab the next digit (5) from the dividend, add it to 32, then carry on: 325 / 644

Step 3:
644 goes into 325 0 times with a remainder of 325.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 325, we end up with 325.
Include the next digit (7) from the dividend after 325, then repeat: 3257 / 644

Moving on to step 4:
When dividing 3257 by 644, we get 5 with a remainder of 37.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Deduct 3220 from 3257 and we're left with 37.
Take the next digit (4) from the dividend and append it to 37, then repeat: 374 / 644

Going ahead to step 5:
When dividing 374 by 644, we get 0 with a remainder of 374.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
If we take 0 away from 374, we end up with 374.
Append the next digit (6) from the dividend to 374 and continue with: 3746 / 644

Going ahead to step 6:
If we divide 3746 by 644, we get 5 and a remainder of 526.
The number 5 becomes the next digit in our result. 
Result so far: 505.0
Deduct 3220 from 3746 and we're left with 526.
Include the next digit (3) from the dividend after 526, then repeat: 5263 / 644

Let's proceed to step 7:
When dividing 5263 by 644, we get 8 with a remainder of 111.
Put 8 as the next digit of the answer. 
Result so far: 5058.0
Deduct 5152 from 5263 and we're left with 111.
Append the next digit (8) from the dividend to 111 and continue with: 1118 / 644

Advancing to step 8:
The number 644 fits into 1118 1 times, leaving a remainder of 474.
The number 1 becomes the next digit in our result. 
Result so far: 50581.0
If we take 644 away from 1118, we end up with 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Step 9:
644 goes into 4740 7 times with a remainder of 232.
The next digit of our result is 7. 
Result so far: 50581.7
Deduct 4508 from 4740 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Going ahead to step 10:
2320 divided by 644 is 3 with a remainder of 388.
Put 3 as the next digit of the answer. 
Result so far: 50581.73
If we take 1932 away from 2320, we end up with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Going ahead to step 11:
When dividing 3880 by 644, we get 6 with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 50581.736
If we subtract 3864 from 3880, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
644 goes into 160 0 times with a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 50581.736
Deduct 0 from 160 and we're left with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 13:
When dividing 1600 by 644, we get 2 with a remainder of 312.
Record the quotient 2 as the next digit in the result. 
Result so far: 50581.73602
If we subtract 1288 from 1600, we get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

On to step 14:
The number 644 fits into 3120 4 times, leaving a remainder of 544.
Record the quotient 4 as the next digit in the result. 
Result so far: 50581.736024
Subtracting 2576 from 3120 leaves us with 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Let's proceed to step 15:
644 can be fit into 5440 8 times, resulting in a remainder of 288.
Use 8 as the next digit of our solution. 
Result so far: 50581.7360248
Subtracting 5152 from 5440 leaves us with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

On to step 16:
644 can be fit into 2880 4 times, resulting in a remainder of 304.
Record the quotient 4 as the next digit in the result. 
Result so far: 50581.73602484
Subtract 2576 from 2880 to get 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Our division results in 50581.73602484 with a remaining 3.04e-07.