57881345 ÷ 640 
The aim is to understand the frequency of 640 in 57881345.

Moving on to step 1:
640 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 640

On to step 2:
The number 640 fits into 57 0 times, leaving a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Bring next digit (8) of the dividend behind the 57 and repeat the process: 578 / 640

On to step 3:
640 goes into 578 0 times with a remainder of 578.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 578, we end up with 578.
Fetch the next digit (8) from the dividend, attach it to 578 and continue: 5788 / 640

Moving on to step 4:
If we divide 5788 by 640, we get 9 and a remainder of 28.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 5760 from 5788 and we're left with 28.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 640

Advancing to step 5:
281 divided by 640 is 0 with a remainder of 281.
Use 0 as the next digit of our solution. 
Result so far: 90.0
The remainder is 281 after subtracting 0 from 281.
Bring next digit (3) of the dividend behind the 281 and repeat the process: 2813 / 640

Let's proceed to step 6:
The number 640 fits into 2813 4 times, leaving a remainder of 253.
The next digit of our result is 4. 
Result so far: 904.0
If we take 2560 away from 2813, we end up with 253.
Fetch the next digit (4) from the dividend, attach it to 253 and continue: 2534 / 640

Advancing to step 7:
640 goes into 2534 3 times with a remainder of 614.
Record the quotient 3 as the next digit in the result. 
Result so far: 9043.0
Deduct 1920 from 2534 and we're left with 614.
Bring next digit (5) of the dividend behind the 614 and repeat the process: 6145 / 640

On to step 8:
640 goes into 6145 9 times with a remainder of 385.
Write down 9 as next digit of the result. 
Result so far: 90439.0
Deduct 5760 from 6145 and we're left with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Moving on to step 9:
3850 divided by 640 is 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 90439.6
If we subtract 3840 from 3850, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
If we divide 100 by 640, we get 0 and a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 90439.6
Subtract 0 from 100 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 11:
640 can be fit into 1000 1 times, resulting in a remainder of 360.
The next digit of our result is 1. 
Result so far: 90439.601
If we subtract 640 from 1000, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 12:
3600 divided by 640 is 5 with a remainder of 400.
Use 5 as the next digit of our solution. 
Result so far: 90439.6015
Subtracting 3200 from 3600 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 13:
The number 640 fits into 4000 6 times, leaving a remainder of 160.
Write down 6 as next digit of the result. 
Result so far: 90439.60156
Subtracting 3840 from 4000 leaves us 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.

Moving on to step 14:
The number 640 fits into 1600 2 times, leaving a remainder of 320.
Record the quotient 2 as the next digit in the result. 
Result so far: 90439.601562
The remainder is 320 after subtracting 1280 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 15:
640 goes into 3200 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 90439.6015625
Subtract 3200 from 3200 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 16:
If we divide 0 by 640, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 90439.6015625
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 90439.6015625, with a leftover of 0.0.