Let's divide 71766391 by 561
The aim is to understand the frequency of 561 in 71766391.

Moving on to step 1:
The number 561 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 561

Going ahead to step 2:
561 goes into 71 0 times with a remainder of 71.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 71 and we're left with 71.
Append the next digit (7) from the dividend to 71 and continue with: 717 / 561

Advancing to step 3:
The number 561 fits into 717 1 times, leaving a remainder of 156.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 156 after subtracting 561 from 717.
Fetch the next digit (6) from the dividend, attach it to 156 and continue: 1566 / 561

Moving on to step 4:
When dividing 1566 by 561, we get 2 with a remainder of 444.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 1122 from 1566, we get 444.
Fetch the next digit (6) from the dividend, attach it to 444 and continue: 4446 / 561

On to step 5:
If we divide 4446 by 561, we get 7 and a remainder of 519.
The next digit of our result is 7. 
Result so far: 127.0
The remainder is 519 after subtracting 3927 from 4446.
Bring next digit (3) of the dividend behind the 519 and repeat the process: 5193 / 561

Advancing to step 6:
When dividing 5193 by 561, we get 9 with a remainder of 144.
Record the quotient 9 as the next digit in the result. 
Result so far: 1279.0
Deduct 5049 from 5193 and we're left with 144.
Fetch the next digit (9) from the dividend, attach it to 144 and continue: 1449 / 561

Advancing to step 7:
561 can be fit into 1449 2 times, resulting in a remainder of 327.
Put 2 as the next digit of the answer. 
Result so far: 12792.0
If we take 1122 away from 1449, we end up with 327.
Include the next digit (1) from the dividend after 327, then repeat: 3271 / 561

On to step 8:
561 goes into 3271 5 times with a remainder of 466.
The next digit of our result is 5. 
Result so far: 127925.0
Subtract 2805 from 3271 to get 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Let's proceed to step 9:
4660 divided by 561 is 8 with a remainder of 172.
Put 8 as the next digit of the answer. 
Result so far: 127925.8
If we take 4488 away from 4660, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Moving on to step 10:
The number 561 fits into 1720 3 times, leaving a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 127925.83
Subtract 1683 from 1720 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 11:
561 can be fit into 370 0 times, resulting in a remainder of 370.
Use 0 as the next digit of our solution. 
Result so far: 127925.83
Subtract 0 from 370 to get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 12:
The number 561 fits into 3700 6 times, leaving a remainder of 334.
The number 6 becomes the next digit in our result. 
Result so far: 127925.8306
Deduct 3366 from 3700 and we're left with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Moving on to step 13:
When dividing 3340 by 561, we get 5 with a remainder of 535.
The number 5 becomes the next digit in our result. 
Result so far: 127925.83065
If we take 2805 away from 3340, we end up with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

On to step 14:
5350 divided by 561 is 9 with a remainder of 301.
Use 9 as the next digit of our solution. 
Result so far: 127925.830659
Deduct 5049 from 5350 and we're left with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Advancing to step 15:
If we divide 3010 by 561, we get 5 and a remainder of 205.
Use 5 as the next digit of our solution. 
Result so far: 127925.8306595
Deduct 2805 from 3010 and we're left with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Step 16:
561 goes into 2050 3 times with a remainder of 367.
Put 3 as the next digit of the answer. 
Result so far: 127925.83065953
Deduct 1683 from 2050 and we're left with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Our division results in 127925.83065953 with a remaining 3.67e-07.