We're dividing 77925443 by 646 
The aim is to understand the frequency of 646 in 77925443.

Advancing to step 1:
646 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 646

Advancing to step 2:
When dividing 77 by 646, we get 0 with a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Grab the next digit (9) from the dividend, add it to 77, then carry on: 779 / 646

Moving on to step 3:
646 goes into 779 1 times with a remainder of 133.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 133 after subtracting 646 from 779.
Grab the next digit (2) from the dividend, add it to 133, then carry on: 1332 / 646

Advancing to step 4:
If we divide 1332 by 646, we get 2 and a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Deduct 1292 from 1332 and we're left with 40.
Grab the next digit (5) from the dividend, add it to 40, then carry on: 405 / 646

Going ahead to step 5:
When dividing 405 by 646, we get 0 with a remainder of 405.
The next digit of our result is 0. 
Result so far: 120.0
Deduct 0 from 405 and we're left with 405.
Bring next digit (4) of the dividend behind the 405 and repeat the process: 4054 / 646

Going ahead to step 6:
If we divide 4054 by 646, we get 6 and a remainder of 178.
Record the quotient 6 as the next digit in the result. 
Result so far: 1206.0
Subtracting 3876 from 4054 leaves us with 178.
Take the next digit (4) from the dividend and append it to 178, then repeat: 1784 / 646

Let's proceed to step 7:
646 goes into 1784 2 times with a remainder of 492.
Record the quotient 2 as the next digit in the result. 
Result so far: 12062.0
Deduct 1292 from 1784 and we're left with 492.
Take the next digit (3) from the dividend and append it to 492, then repeat: 4923 / 646

On to step 8:
646 goes into 4923 7 times with a remainder of 401.
The number 7 becomes the next digit in our result. 
Result so far: 120627.0
The remainder is 401 after subtracting 4522 from 4923.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Advancing to step 9:
The number 646 fits into 4010 6 times, leaving a remainder of 134.
The number 6 becomes the next digit in our result. 
Result so far: 120627.6
If we subtract 3876 from 4010, we get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

On to step 10:
646 goes into 1340 2 times with a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 120627.62
Subtracting 1292 from 1340 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 11:
When dividing 480 by 646, we get 0 with a remainder of 480.
Write down 0 as next digit of the result. 
Result so far: 120627.62
Subtracting 0 from 480 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Going ahead to step 12:
When dividing 4800 by 646, we get 7 with a remainder of 278.
Write down 7 as next digit of the result. 
Result so far: 120627.6207
The remainder is 278 after subtracting 4522 from 4800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Going ahead to step 13:
The number 646 fits into 2780 4 times, leaving a remainder of 196.
Write down 4 as next digit of the result. 
Result so far: 120627.62074
Subtracting 2584 from 2780 leaves us 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.

Going ahead to step 14:
When dividing 1960 by 646, we get 3 with a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 120627.620743
If we take 1938 away from 1960, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 15:
646 can be fit into 220 0 times, resulting in a remainder of 220.
Write down 0 as next digit of the result. 
Result so far: 120627.620743
If we take 0 away from 220, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 16:
When dividing 2200 by 646, we get 3 with a remainder of 262.
Write down 3 as next digit of the result. 
Result so far: 120627.62074303
The remainder is 262 after subtracting 1938 from 2200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

The final result is 120627.62074303 with a remainder of 2.62e-07.