We look at the division of 90706960 by 641 
The aim is to understand the frequency of 641 in 90706960.

Let's proceed to step 1:
9 divided by 641 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 641

Moving on to step 2:
641 goes into 90 0 times with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Take the next digit (7) from the dividend and append it to 90, then repeat: 907 / 641

Let's proceed to step 3:
641 goes into 907 1 times with a remainder of 266.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 641 from 907 leaves us with 266.
Take the next digit (0) from the dividend and append it to 266, then repeat: 2660 / 641

Let's proceed to step 4:
When dividing 2660 by 641, we get 4 with a remainder of 96.
Put 4 as the next digit of the answer. 
Result so far: 14.0
Deduct 2564 from 2660 and we're left with 96.
Take the next digit (6) from the dividend and append it to 96, then repeat: 966 / 641

Moving on to step 5:
966 divided by 641 is 1 with a remainder of 325.
The number 1 becomes the next digit in our result. 
Result so far: 141.0
The remainder is 325 after subtracting 641 from 966.
Append the next digit (9) from the dividend to 325 and continue with: 3259 / 641

Let's proceed to step 6:
When dividing 3259 by 641, we get 5 with a remainder of 54.
Use 5 as the next digit of our solution. 
Result so far: 1415.0
The remainder is 54 after subtracting 3205 from 3259.
Bring next digit (6) of the dividend behind the 54 and repeat the process: 546 / 641

Moving on to step 7:
The number 641 fits into 546 0 times, leaving a remainder of 546.
The number 0 becomes the next digit in our result. 
Result so far: 14150.0
Subtract 0 from 546 to get 546.
Append the next digit (0) from the dividend to 546 and continue with: 5460 / 641

On to step 8:
641 can be fit into 5460 8 times, resulting in a remainder of 332.
Put 8 as the next digit of the answer. 
Result so far: 141508.0
If we subtract 5128 from 5460, we get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Going ahead to step 9:
If we divide 3320 by 641, we get 5 and a remainder of 115.
The next digit of our result is 5. 
Result so far: 141508.5
If we subtract 3205 from 3320, we get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Step 10:
If we divide 1150 by 641, we get 1 and a remainder of 509.
Record the quotient 1 as the next digit in the result. 
Result so far: 141508.51
Deduct 641 from 1150 and we're left with 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

Step 11:
If we divide 5090 by 641, we get 7 and a remainder of 603.
The number 7 becomes the next digit in our result. 
Result so far: 141508.517
Subtracting 4487 from 5090 leaves us with 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

Step 12:
If we divide 6030 by 641, we get 9 and a remainder of 261.
Use 9 as the next digit of our solution. 
Result so far: 141508.5179
Deduct 5769 from 6030 and we're left with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

Let's proceed to step 13:
If we divide 2610 by 641, we get 4 and a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 141508.51794
Deduct 2564 from 2610 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 14:
460 divided by 641 is 0 with a remainder of 460.
Put 0 as the next digit of the answer. 
Result so far: 141508.51794
Subtract 0 from 460 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Let's proceed to step 15:
The number 641 fits into 4600 7 times, leaving a remainder of 113.
The number 7 becomes the next digit in our result. 
Result so far: 141508.5179407
If we subtract 4487 from 4600, we get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Step 16:
641 can be fit into 1130 1 times, resulting in a remainder of 489.
The number 1 becomes the next digit in our result. 
Result so far: 141508.51794071
Subtract 641 from 1130 to get 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

After the division, we end up with 141508.51794071 and a remainder of 4.89e-07.