We look at the division of 21237763 by 316 
The aim is to understand the frequency of 316 in 21237763.

Let's proceed to step 1:
2 divided by 316 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 316

Moving on to step 2:
316 goes into 21 0 times with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (2) of the dividend behind the 21 and repeat the process: 212 / 316

Advancing to step 3:
When dividing 212 by 316, we get 0 with a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Append the next digit (3) from the dividend to 212 and continue with: 2123 / 316

Step 4:
2123 divided by 316 is 6 with a remainder of 227.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 1896 from 2123 leaves us with 227.
Bring next digit (7) of the dividend behind the 227 and repeat the process: 2277 / 316

Moving on to step 5:
316 can be fit into 2277 7 times, resulting in a remainder of 65.
Write down 7 as next digit of the result. 
Result so far: 67.0
Subtracting 2212 from 2277 leaves us with 65.
Append the next digit (7) from the dividend to 65 and continue with: 657 / 316

Step 6:
316 can be fit into 657 2 times, resulting in a remainder of 25.
The next digit of our result is 2. 
Result so far: 672.0
Deduct 632 from 657 and we're left with 25.
Fetch the next digit (6) from the dividend, attach it to 25 and continue: 256 / 316

On to step 7:
The number 316 fits into 256 0 times, leaving a remainder of 256.
Put 0 as the next digit of the answer. 
Result so far: 6720.0
If we take 0 away from 256, we end up with 256.
Append the next digit (3) from the dividend to 256 and continue with: 2563 / 316

Going ahead to step 8:
2563 divided by 316 is 8 with a remainder of 35.
The next digit of our result is 8. 
Result so far: 67208.0
Deduct 2528 from 2563 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 9:
When dividing 350 by 316, we get 1 with a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 67208.1
The remainder is 34 after subtracting 316 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 10:
If we divide 340 by 316, we get 1 and a remainder of 24.
Record the quotient 1 as the next digit in the result. 
Result so far: 67208.11
If we take 316 away from 340, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 67208.11 and a remainder of 0.024.