We divide 25257666 by 210
The aim is to understand the frequency of 210 in 25257666.

Going ahead to step 1:
210 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 210

Advancing to step 2:
25 divided by 210 is 0 with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Append the next digit (2) from the dividend to 25 and continue with: 252 / 210

Moving on to step 3:
252 divided by 210 is 1 with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 210 from 252 leaves us with 42.
Take the next digit (5) from the dividend and append it to 42, then repeat: 425 / 210

Advancing to step 4:
210 can be fit into 425 2 times, resulting in a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 420 from 425 to get 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 210

Step 5:
When dividing 57 by 210, we get 0 with a remainder of 57.
The number 0 becomes the next digit in our result. 
Result so far: 120.0
Deduct 0 from 57 and we're left with 57.
Grab the next digit (6) from the dividend, add it to 57, then carry on: 576 / 210

Moving on to step 6:
210 can be fit into 576 2 times, resulting in a remainder of 156.
Write down 2 as next digit of the result. 
Result so far: 1202.0
Subtracting 420 from 576 leaves us with 156.
Bring next digit (6) of the dividend behind the 156 and repeat the process: 1566 / 210

Step 7:
The number 210 fits into 1566 7 times, leaving a remainder of 96.
Write down 7 as next digit of the result. 
Result so far: 12027.0
Subtract 1470 from 1566 to get 96.
Append the next digit (6) from the dividend to 96 and continue with: 966 / 210

Moving on to step 8:
210 goes into 966 4 times with a remainder of 126.
Put 4 as the next digit of the answer. 
Result so far: 120274.0
Deduct 840 from 966 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 9:
210 goes into 1260 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 120274.6
Subtract 1260 from 1260 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
If we divide 0 by 210, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 120274.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 11:
If we divide 0 by 210, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 120274.6
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 120274.6 with a balance of 0.0.