We look at the division of 25213817 by 766 
The aim is to understand the frequency of 766 in 25213817.

Going ahead to step 1:
766 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 766

Going ahead to step 2:
If we divide 25 by 766, we get 0 and a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Append the next digit (2) from the dividend to 25 and continue with: 252 / 766

Moving on to step 3:
When dividing 252 by 766, we get 0 with a remainder of 252.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 252 after subtracting 0 from 252.
Append the next digit (1) from the dividend to 252 and continue with: 2521 / 766

Going ahead to step 4:
If we divide 2521 by 766, we get 3 and a remainder of 223.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 2298 away from 2521, we end up with 223.
Include the next digit (3) from the dividend after 223, then repeat: 2233 / 766

On to step 5:
766 goes into 2233 2 times with a remainder of 701.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
Subtracting 1532 from 2233 leaves us with 701.
Append the next digit (8) from the dividend to 701 and continue with: 7018 / 766

Let's proceed to step 6:
766 goes into 7018 9 times with a remainder of 124.
Record the quotient 9 as the next digit in the result. 
Result so far: 329.0
Deduct 6894 from 7018 and we're left with 124.
Fetch the next digit (1) from the dividend, attach it to 124 and continue: 1241 / 766

Going ahead to step 7:
766 goes into 1241 1 times with a remainder of 475.
Write down 1 as next digit of the result. 
Result so far: 3291.0
The remainder is 475 after subtracting 766 from 1241.
Take the next digit (7) from the dividend and append it to 475, then repeat: 4757 / 766

On to step 8:
The number 766 fits into 4757 6 times, leaving a remainder of 161.
Write down 6 as next digit of the result. 
Result so far: 32916.0
If we subtract 4596 from 4757, we get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Advancing to step 9:
1610 divided by 766 is 2 with a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 32916.2
Subtracting 1532 from 1610 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 10:
The number 766 fits into 780 1 times, leaving a remainder of 14.
The next digit of our result is 1. 
Result so far: 32916.21
Subtracting 766 from 780 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
766 can be fit into 140 0 times, resulting in a remainder of 140.
Write down 0 as next digit of the result. 
Result so far: 32916.21
If we take 0 away from 140, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 12:
If we divide 1400 by 766, we get 1 and a remainder of 634.
Put 1 as the next digit of the answer. 
Result so far: 32916.2101
Deduct 766 from 1400 and we're left with 634.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6340, and continue the process.

Advancing to step 13:
When dividing 6340 by 766, we get 8 with a remainder of 212.
The number 8 becomes the next digit in our result. 
Result so far: 32916.21018
Subtracting 6128 from 6340 leaves us with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Step 14:
2120 divided by 766 is 2 with a remainder of 588.
Use 2 as the next digit of our solution. 
Result so far: 32916.210182
Subtract 1532 from 2120 to get 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Going ahead to step 15:
When dividing 5880 by 766, we get 7 with a remainder of 518.
Use 7 as the next digit of our solution. 
Result so far: 32916.2101827
Deduct 5362 from 5880 and we're left with 518.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Advancing to step 16:
766 goes into 5180 6 times with a remainder of 584.
The next digit of our result is 6. 
Result so far: 32916.21018276
The remainder is 584 after subtracting 4596 from 5180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

After the division, we end up with 32916.21018276 and a remainder of 5.84e-07.