Let's divide 21738729 by 315
The aim is to understand the frequency of 315 in 21738729.

On to step 1:
The number 315 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 315

On to step 2:
The number 315 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (7) from the dividend after 21, then repeat: 217 / 315

Step 3:
315 goes into 217 0 times with a remainder of 217.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 217 and we're left with 217.
Grab the next digit (3) from the dividend, add it to 217, then carry on: 2173 / 315

Moving on to step 4:
315 goes into 2173 6 times with a remainder of 283.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 283 after subtracting 1890 from 2173.
Append the next digit (8) from the dividend to 283 and continue with: 2838 / 315

Let's proceed to step 5:
If we divide 2838 by 315, we get 9 and a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
The remainder is 3 after subtracting 2835 from 2838.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 315

Moving on to step 6:
315 goes into 37 0 times with a remainder of 37.
Use 0 as the next digit of our solution. 
Result so far: 690.0
Subtracting 0 from 37 leaves us with 37.
Include the next digit (2) from the dividend after 37, then repeat: 372 / 315

On to step 7:
If we divide 372 by 315, we get 1 and a remainder of 57.
Record the quotient 1 as the next digit in the result. 
Result so far: 6901.0
The remainder is 57 after subtracting 315 from 372.
Grab the next digit (9) from the dividend, add it to 57, then carry on: 579 / 315

Going ahead to step 8:
If we divide 579 by 315, we get 1 and a remainder of 264.
Record the quotient 1 as the next digit in the result. 
Result so far: 69011.0
The remainder is 264 after subtracting 315 from 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Let's proceed to step 9:
315 can be fit into 2640 8 times, resulting in a remainder of 120.
Put 8 as the next digit of the answer. 
Result so far: 69011.8
The remainder is 120 after subtracting 2520 from 2640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 10:
315 goes into 1200 3 times with a remainder of 255.
The next digit of our result is 3. 
Result so far: 69011.83
The remainder is 255 after subtracting 945 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

On to step 11:
315 goes into 2550 8 times with a remainder of 30.
Write down 8 as next digit of the result. 
Result so far: 69011.838
If we take 2520 away from 2550, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 12:
300 divided by 315 is 0 with a remainder of 300.
Put 0 as the next digit of the answer. 
Result so far: 69011.838
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 13:
315 can be fit into 3000 9 times, resulting in a remainder of 165.
Record the quotient 9 as the next digit in the result. 
Result so far: 69011.83809
If we take 2835 away from 3000, we end up with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 14:
315 goes into 1650 5 times with a remainder of 75.
The next digit of our result is 5. 
Result so far: 69011.838095
Subtract 1575 from 1650 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 15:
When dividing 750 by 315, we get 2 with a remainder of 120.
Use 2 as the next digit of our solution. 
Result so far: 69011.8380952
The remainder is 120 after subtracting 630 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 16:
When dividing 1200 by 315, we get 3 with a remainder of 255.
Put 3 as the next digit of the answer. 
Result so far: 69011.83809523
Subtracting 945 from 1200 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

The quotient of the division is 69011.83809523, and the remainder is 2.55e-07.