77754879 divided by 639 
The aim is to understand the frequency of 639 in 77754879.

Going ahead to step 1:
If we divide 7 by 639, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 639

On to step 2:
If we divide 77 by 639, we get 0 and a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Grab the next digit (7) from the dividend, add it to 77, then carry on: 777 / 639

Advancing to step 3:
639 goes into 777 1 times with a remainder of 138.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 639 from 777 and we're left with 138.
Take the next digit (5) from the dividend and append it to 138, then repeat: 1385 / 639

Going ahead to step 4:
1385 divided by 639 is 2 with a remainder of 107.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 1278 from 1385 leaves us with 107.
Grab the next digit (4) from the dividend, add it to 107, then carry on: 1074 / 639

Step 5:
1074 divided by 639 is 1 with a remainder of 435.
Record the quotient 1 as the next digit in the result. 
Result so far: 121.0
The remainder is 435 after subtracting 639 from 1074.
Fetch the next digit (8) from the dividend, attach it to 435 and continue: 4358 / 639

Let's proceed to step 6:
4358 divided by 639 is 6 with a remainder of 524.
The next digit of our result is 6. 
Result so far: 1216.0
The remainder is 524 after subtracting 3834 from 4358.
Bring next digit (7) of the dividend behind the 524 and repeat the process: 5247 / 639

Step 7:
639 goes into 5247 8 times with a remainder of 135.
Put 8 as the next digit of the answer. 
Result so far: 12168.0
If we take 5112 away from 5247, we end up with 135.
Include the next digit (9) from the dividend after 135, then repeat: 1359 / 639

Let's proceed to step 8:
1359 divided by 639 is 2 with a remainder of 81.
Record the quotient 2 as the next digit in the result. 
Result so far: 121682.0
If we take 1278 away from 1359, we end up with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 9:
When dividing 810 by 639, we get 1 with a remainder of 171.
Put 1 as the next digit of the answer. 
Result so far: 121682.1
If we subtract 639 from 810, we get 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Moving on to step 10:
639 goes into 1710 2 times with a remainder of 432.
Record the quotient 2 as the next digit in the result. 
Result so far: 121682.12
If we subtract 1278 from 1710, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Advancing to step 11:
4320 divided by 639 is 6 with a remainder of 486.
Use 6 as the next digit of our solution. 
Result so far: 121682.126
If we take 3834 away from 4320, we end up with 486.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4860, and continue the process.

Going ahead to step 12:
The number 639 fits into 4860 7 times, leaving a remainder of 387.
Use 7 as the next digit of our solution. 
Result so far: 121682.1267
Deduct 4473 from 4860 and we're left with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Step 13:
3870 divided by 639 is 6 with a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 121682.12676
The remainder is 36 after subtracting 3834 from 3870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
The number 639 fits into 360 0 times, leaving a remainder of 360.
Put 0 as the next digit of the answer. 
Result so far: 121682.12676
The remainder is 360 after subtracting 0 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 15:
When dividing 3600 by 639, we get 5 with a remainder of 405.
Write down 5 as next digit of the result. 
Result so far: 121682.1267605
Subtract 3195 from 3600 to get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Moving on to step 16:
4050 divided by 639 is 6 with a remainder of 216.
Record the quotient 6 as the next digit in the result. 
Result so far: 121682.12676056
Deduct 3834 from 4050 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

The quotient of the division is 121682.12676056, and the remainder is 2.16e-07.