Let's divide 52485123 by 645
The aim is to understand the frequency of 645 in 52485123.

Going ahead to step 1:
5 divided by 645 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 645

Going ahead to step 2:
645 goes into 52 0 times with a remainder of 52.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Bring next digit (4) of the dividend behind the 52 and repeat the process: 524 / 645

Moving on to step 3:
If we divide 524 by 645, we get 0 and a remainder of 524.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 524 after subtracting 0 from 524.
Take the next digit (8) from the dividend and append it to 524, then repeat: 5248 / 645

Going ahead to step 4:
If we divide 5248 by 645, we get 8 and a remainder of 88.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 5160 from 5248 to get 88.
Fetch the next digit (5) from the dividend, attach it to 88 and continue: 885 / 645

Let's proceed to step 5:
645 can be fit into 885 1 times, resulting in a remainder of 240.
The next digit of our result is 1. 
Result so far: 81.0
If we take 645 away from 885, we end up with 240.
Take the next digit (1) from the dividend and append it to 240, then repeat: 2401 / 645

On to step 6:
2401 divided by 645 is 3 with a remainder of 466.
Put 3 as the next digit of the answer. 
Result so far: 813.0
If we subtract 1935 from 2401, we get 466.
Bring next digit (2) of the dividend behind the 466 and repeat the process: 4662 / 645

On to step 7:
When dividing 4662 by 645, we get 7 with a remainder of 147.
The number 7 becomes the next digit in our result. 
Result so far: 8137.0
The remainder is 147 after subtracting 4515 from 4662.
Grab the next digit (3) from the dividend, add it to 147, then carry on: 1473 / 645

Going ahead to step 8:
1473 divided by 645 is 2 with a remainder of 183.
Use 2 as the next digit of our solution. 
Result so far: 81372.0
Subtract 1290 from 1473 to get 183.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

Going ahead to step 9:
1830 divided by 645 is 2 with a remainder of 540.
Write down 2 as next digit of the result. 
Result so far: 81372.2
Subtract 1290 from 1830 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Let's proceed to step 10:
If we divide 5400 by 645, we get 8 and a remainder of 240.
The number 8 becomes the next digit in our result. 
Result so far: 81372.28
Subtract 5160 from 5400 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 11:
645 goes into 2400 3 times with a remainder of 465.
Use 3 as the next digit of our solution. 
Result so far: 81372.283
If we subtract 1935 from 2400, we get 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

On to step 12:
645 goes into 4650 7 times with a remainder of 135.
Put 7 as the next digit of the answer. 
Result so far: 81372.2837
The remainder is 135 after subtracting 4515 from 4650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Moving on to step 13:
645 can be fit into 1350 2 times, resulting in a remainder of 60.
Put 2 as the next digit of the answer. 
Result so far: 81372.28372
Deduct 1290 from 1350 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 14:
645 goes into 600 0 times with a remainder of 600.
Write down 0 as next digit of the result. 
Result so far: 81372.28372
If we subtract 0 from 600, we get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Let's proceed to step 15:
645 can be fit into 6000 9 times, resulting in a remainder of 195.
Put 9 as the next digit of the answer. 
Result so far: 81372.2837209
Subtracting 5805 from 6000 leaves us with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Going ahead to step 16:
The number 645 fits into 1950 3 times, leaving a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 81372.28372093
Subtract 1935 from 1950 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The quotient of the division is 81372.28372093, and the remainder is 1.5e-08.