51581407 ÷ 264 
The aim is to understand the frequency of 264 in 51581407.

On to step 1:
264 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
Subtract 0 from 5 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 264

Let's proceed to step 2:
264 can be fit into 51 0 times, resulting in a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Grab the next digit (5) from the dividend, add it to 51, then carry on: 515 / 264

Moving on to step 3:
515 divided by 264 is 1 with a remainder of 251.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 264 from 515 and we're left with 251.
Append the next digit (8) from the dividend to 251 and continue with: 2518 / 264

Moving on to step 4:
The number 264 fits into 2518 9 times, leaving a remainder of 142.
Write down 9 as next digit of the result. 
Result so far: 19.0
Subtracting 2376 from 2518 leaves us with 142.
Fetch the next digit (1) from the dividend, attach it to 142 and continue: 1421 / 264

On to step 5:
264 can be fit into 1421 5 times, resulting in a remainder of 101.
Record the quotient 5 as the next digit in the result. 
Result so far: 195.0
If we subtract 1320 from 1421, we get 101.
Append the next digit (4) from the dividend to 101 and continue with: 1014 / 264

Advancing to step 6:
264 goes into 1014 3 times with a remainder of 222.
The next digit of our result is 3. 
Result so far: 1953.0
If we take 792 away from 1014, we end up with 222.
Fetch the next digit (0) from the dividend, attach it to 222 and continue: 2220 / 264

Moving on to step 7:
When dividing 2220 by 264, we get 8 with a remainder of 108.
Record the quotient 8 as the next digit in the result. 
Result so far: 19538.0
The remainder is 108 after subtracting 2112 from 2220.
Include the next digit (7) from the dividend after 108, then repeat: 1087 / 264

Moving on to step 8:
1087 divided by 264 is 4 with a remainder of 31.
Put 4 as the next digit of the answer. 
Result so far: 195384.0
The remainder is 31 after subtracting 1056 from 1087.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 9:
264 can be fit into 310 1 times, resulting in a remainder of 46.
Put 1 as the next digit of the answer. 
Result so far: 195384.1
The remainder is 46 after subtracting 264 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
460 divided by 264 is 1 with a remainder of 196.
Write down 1 as next digit of the result. 
Result so far: 195384.11
If we take 264 away from 460, we end up with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

After the division, we end up with 195384.11 and a remainder of 0.196.