We look at the division of 76520319 by 861 
The aim is to understand the frequency of 861 in 76520319.

Going ahead to step 1:
If we divide 7 by 861, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 861

Step 2:
When dividing 76 by 861, we get 0 with a remainder of 76.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 76, we end up with 76.
Take the next digit (5) from the dividend and append it to 76, then repeat: 765 / 861

Step 3:
The number 861 fits into 765 0 times, leaving a remainder of 765.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 765, we end up with 765.
Take the next digit (2) from the dividend and append it to 765, then repeat: 7652 / 861

Going ahead to step 4:
861 can be fit into 7652 8 times, resulting in a remainder of 764.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 6888 from 7652 and we're left with 764.
Grab the next digit (0) from the dividend, add it to 764, then carry on: 7640 / 861

Step 5:
861 can be fit into 7640 8 times, resulting in a remainder of 752.
Write down 8 as next digit of the result. 
Result so far: 88.0
Deduct 6888 from 7640 and we're left with 752.
Bring next digit (3) of the dividend behind the 752 and repeat the process: 7523 / 861

Step 6:
If we divide 7523 by 861, we get 8 and a remainder of 635.
Record the quotient 8 as the next digit in the result. 
Result so far: 888.0
Subtract 6888 from 7523 to get 635.
Fetch the next digit (1) from the dividend, attach it to 635 and continue: 6351 / 861

Going ahead to step 7:
If we divide 6351 by 861, we get 7 and a remainder of 324.
Put 7 as the next digit of the answer. 
Result so far: 8887.0
If we subtract 6027 from 6351, we get 324.
Bring next digit (9) of the dividend behind the 324 and repeat the process: 3249 / 861

Moving on to step 8:
When dividing 3249 by 861, we get 3 with a remainder of 666.
Record the quotient 3 as the next digit in the result. 
Result so far: 88873.0
If we take 2583 away from 3249, we end up with 666.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6660, and continue the process.

Step 9:
861 goes into 6660 7 times with a remainder of 633.
Write down 7 as next digit of the result. 
Result so far: 88873.7
The remainder is 633 after subtracting 6027 from 6660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6330, and continue the process.

On to step 10:
861 can be fit into 6330 7 times, resulting in a remainder of 303.
Write down 7 as next digit of the result. 
Result so far: 88873.77
Subtract 6027 from 6330 to get 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Our division results in 88873.77 with a remaining 0.303.