Let's divide 2571590 by 816
The aim is to understand the frequency of 816 in 2571590.

Step 1:
If we divide 2 by 816, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 816

Advancing to step 2:
If we divide 25 by 816, we get 0 and a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Bring next digit (7) of the dividend behind the 25 and repeat the process: 257 / 816

On to step 3:
If we divide 257 by 816, we get 0 and a remainder of 257.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 257, we end up with 257.
Grab the next digit (1) from the dividend, add it to 257, then carry on: 2571 / 816

On to step 4:
When dividing 2571 by 816, we get 3 with a remainder of 123.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 2448 from 2571 and we're left with 123.
Take the next digit (5) from the dividend and append it to 123, then repeat: 1235 / 816

Advancing to step 5:
When dividing 1235 by 816, we get 1 with a remainder of 419.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Deduct 816 from 1235 and we're left with 419.
Include the next digit (9) from the dividend after 419, then repeat: 4199 / 816

On to step 6:
816 can be fit into 4199 5 times, resulting in a remainder of 119.
Record the quotient 5 as the next digit in the result. 
Result so far: 315.0
Deduct 4080 from 4199 and we're left with 119.
Grab the next digit (0) from the dividend, add it to 119, then carry on: 1190 / 816

Let's proceed to step 7:
816 goes into 1190 1 times with a remainder of 374.
The next digit of our result is 1. 
Result so far: 3151.0
If we take 816 away from 1190, we end up with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Step 8:
When dividing 3740 by 816, we get 4 with a remainder of 476.
Use 4 as the next digit of our solution. 
Result so far: 3151.4
Subtracting 3264 from 3740 leaves us with 476.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

On to step 9:
4760 divided by 816 is 5 with a remainder of 680.
Put 5 as the next digit of the answer. 
Result so far: 3151.45
If we take 4080 away from 4760, we end up with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Going ahead to step 10:
816 goes into 6800 8 times with a remainder of 272.
The number 8 becomes the next digit in our result. 
Result so far: 3151.458
Subtract 6528 from 6800 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 11:
If we divide 2720 by 816, we get 3 and a remainder of 272.
The number 3 becomes the next digit in our result. 
Result so far: 3151.4583
Deduct 2448 from 2720 and we're left with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Moving on to step 12:
The number 816 fits into 2720 3 times, leaving a remainder of 272.
Use 3 as the next digit of our solution. 
Result so far: 3151.45833
The remainder is 272 after subtracting 2448 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

The quotient of the division is 3151.45833, and the remainder is 0.000272.