640589 divided by 61 
The aim is to understand the frequency of 61 in 640589.

On to step 1:
If we divide 6 by 61, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 61

On to step 2:
The number 61 fits into 64 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 61 from 64 leaves us with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 61

Advancing to step 3:
61 can be fit into 30 0 times, resulting in a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 30 after subtracting 0 from 30.
Take the next digit (5) from the dividend and append it to 30, then repeat: 305 / 61

Step 4:
61 goes into 305 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 105.0
If we subtract 305 from 305, we get 0.
Take the next digit (8) from the dividend and append it to 0, then repeat: 8 / 61

Moving on to step 5:
If we divide 8 by 61, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 1050.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 61

Advancing to step 6:
When dividing 89 by 61, we get 1 with a remainder of 28.
The number 1 becomes the next digit in our result. 
Result so far: 10501.0
Deduct 61 from 89 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 7:
61 can be fit into 280 4 times, resulting in a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 10501.4
Deduct 244 from 280 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 8:
The number 61 fits into 360 5 times, leaving a remainder of 55.
The next digit of our result is 5. 
Result so far: 10501.45
The remainder is 55 after subtracting 305 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 9:
61 can be fit into 550 9 times, resulting in a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 10501.459
If we subtract 549 from 550, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
The number 61 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 10501.459
The remainder is 10 after subtracting 0 from 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 11:
When dividing 100 by 61, we get 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 10501.45901
Subtract 61 from 100 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 12:
If we divide 390 by 61, we get 6 and a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 10501.459016
Subtracting 366 from 390 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 13:
If we divide 240 by 61, we get 3 and a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 10501.4590163
If we subtract 183 from 240, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 14:
570 divided by 61 is 9 with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 10501.45901639
Subtract 549 from 570 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

In conclusion, the division gives 10501.45901639 with a balance of 2.1e-08.