Let's divide 21857390 by 857
The aim is to understand the frequency of 857 in 21857390.

Step 1:
If we divide 2 by 857, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 857

On to step 2:
857 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 857

On to step 3:
The number 857 fits into 218 0 times, leaving a remainder of 218.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 218 and we're left with 218.
Bring next digit (5) of the dividend behind the 218 and repeat the process: 2185 / 857

Step 4:
857 can be fit into 2185 2 times, resulting in a remainder of 471.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 1714 from 2185 to get 471.
Include the next digit (7) from the dividend after 471, then repeat: 4717 / 857

Moving on to step 5:
The number 857 fits into 4717 5 times, leaving a remainder of 432.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
If we subtract 4285 from 4717, we get 432.
Include the next digit (3) from the dividend after 432, then repeat: 4323 / 857

Let's proceed to step 6:
When dividing 4323 by 857, we get 5 with a remainder of 38.
The number 5 becomes the next digit in our result. 
Result so far: 255.0
The remainder is 38 after subtracting 4285 from 4323.
Include the next digit (9) from the dividend after 38, then repeat: 389 / 857

Let's proceed to step 7:
857 goes into 389 0 times with a remainder of 389.
Write down 0 as next digit of the result. 
Result so far: 2550.0
Deduct 0 from 389 and we're left with 389.
Fetch the next digit (0) from the dividend, attach it to 389 and continue: 3890 / 857

Step 8:
3890 divided by 857 is 4 with a remainder of 462.
Put 4 as the next digit of the answer. 
Result so far: 25504.0
The remainder is 462 after subtracting 3428 from 3890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Step 9:
When dividing 4620 by 857, we get 5 with a remainder of 335.
Use 5 as the next digit of our solution. 
Result so far: 25504.5
Subtracting 4285 from 4620 leaves us with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 10:
3350 divided by 857 is 3 with a remainder of 779.
The number 3 becomes the next digit in our result. 
Result so far: 25504.53
If we take 2571 away from 3350, we end up with 779.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7790, and continue the process.

Let's proceed to step 11:
7790 divided by 857 is 9 with a remainder of 77.
The next digit of our result is 9. 
Result so far: 25504.539
If we take 7713 away from 7790, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Moving on to step 12:
857 goes into 770 0 times with a remainder of 770.
Write down 0 as next digit of the result. 
Result so far: 25504.539
If we take 0 away from 770, we end up with 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7700, and continue the process.

Let's proceed to step 13:
The number 857 fits into 7700 8 times, leaving a remainder of 844.
The number 8 becomes the next digit in our result. 
Result so far: 25504.53908
If we take 6856 away from 7700, we end up with 844.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8440, and continue the process.

Advancing to step 14:
8440 divided by 857 is 9 with a remainder of 727.
Put 9 as the next digit of the answer. 
Result so far: 25504.539089
Subtracting 7713 from 8440 leaves us with 727.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7270, and continue the process.

Advancing to step 15:
7270 divided by 857 is 8 with a remainder of 414.
Use 8 as the next digit of our solution. 
Result so far: 25504.5390898
Subtract 6856 from 7270 to get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

Going ahead to step 16:
If we divide 4140 by 857, we get 4 and a remainder of 712.
Write down 4 as next digit of the result. 
Result so far: 25504.53908984
If we subtract 3428 from 4140, we get 712.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7120, and continue the process.

The final result is 25504.53908984 with a remainder of 7.12e-07.