We look at the division of 56587691 by 243 
The aim is to understand the frequency of 243 in 56587691.

On to step 1:
243 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 243

Step 2:
56 divided by 243 is 0 with a remainder of 56.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 56 and we're left with 56.
Fetch the next digit (5) from the dividend, attach it to 56 and continue: 565 / 243

Let's proceed to step 3:
When dividing 565 by 243, we get 2 with a remainder of 79.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 486 from 565, we get 79.
Grab the next digit (8) from the dividend, add it to 79, then carry on: 798 / 243

Advancing to step 4:
If we divide 798 by 243, we get 3 and a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 23.0
The remainder is 69 after subtracting 729 from 798.
Fetch the next digit (7) from the dividend, attach it to 69 and continue: 697 / 243

Advancing to step 5:
When dividing 697 by 243, we get 2 with a remainder of 211.
Record the quotient 2 as the next digit in the result. 
Result so far: 232.0
Subtract 486 from 697 to get 211.
Append the next digit (6) from the dividend to 211 and continue with: 2116 / 243

Advancing to step 6:
243 can be fit into 2116 8 times, resulting in a remainder of 172.
The number 8 becomes the next digit in our result. 
Result so far: 2328.0
The remainder is 172 after subtracting 1944 from 2116.
Bring next digit (9) of the dividend behind the 172 and repeat the process: 1729 / 243

Going ahead to step 7:
243 goes into 1729 7 times with a remainder of 28.
Use 7 as the next digit of our solution. 
Result so far: 23287.0
Subtracting 1701 from 1729 leaves us with 28.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 243

Going ahead to step 8:
If we divide 281 by 243, we get 1 and a remainder of 38.
Put 1 as the next digit of the answer. 
Result so far: 232871.0
Subtract 243 from 281 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 9:
The number 243 fits into 380 1 times, leaving a remainder of 137.
Use 1 as the next digit of our solution. 
Result so far: 232871.1
If we subtract 243 from 380, we get 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Going ahead to step 10:
When dividing 1370 by 243, we get 5 with a remainder of 155.
The next digit of our result is 5. 
Result so far: 232871.15
Subtracting 1215 from 1370 leaves us with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Let's proceed to step 11:
243 goes into 1550 6 times with a remainder of 92.
The number 6 becomes the next digit in our result. 
Result so far: 232871.156
Subtract 1458 from 1550 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Moving on to step 12:
The number 243 fits into 920 3 times, leaving a remainder of 191.
Put 3 as the next digit of the answer. 
Result so far: 232871.1563
Subtract 729 from 920 to get 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

Going ahead to step 13:
1910 divided by 243 is 7 with a remainder of 209.
Use 7 as the next digit of our solution. 
Result so far: 232871.15637
Subtract 1701 from 1910 to get 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Advancing to step 14:
The number 243 fits into 2090 8 times, leaving a remainder of 146.
Use 8 as the next digit of our solution. 
Result so far: 232871.156378
If we take 1944 away from 2090, we end up with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

On to step 15:
1460 divided by 243 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 232871.1563786
If we subtract 1458 from 1460, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 16:
The number 243 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 232871.1563786
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 232871.1563786 and a remainder of 2e-08.