We divide 990102 by 77
The aim is to understand the frequency of 77 in 990102.

Step 1:
When dividing 9 by 77, we get 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 77

Let's proceed to step 2:
77 goes into 99 1 times with a remainder of 22.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 77 from 99 and we're left with 22.
Bring next digit (0) of the dividend behind the 22 and repeat the process: 220 / 77

Step 3:
If we divide 220 by 77, we get 2 and a remainder of 66.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 154 from 220 leaves us with 66.
Grab the next digit (1) from the dividend, add it to 66, then carry on: 661 / 77

Moving on to step 4:
77 goes into 661 8 times with a remainder of 45.
Write down 8 as next digit of the result. 
Result so far: 128.0
If we subtract 616 from 661, we get 45.
Grab the next digit (0) from the dividend, add it to 45, then carry on: 450 / 77

Let's proceed to step 5:
The number 77 fits into 450 5 times, leaving a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 1285.0
Deduct 385 from 450 and we're left with 65.
Bring next digit (2) of the dividend behind the 65 and repeat the process: 652 / 77

Advancing to step 6:
If we divide 652 by 77, we get 8 and a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 12858.0
Subtracting 616 from 652 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 7:
77 goes into 360 4 times with a remainder of 52.
Write down 4 as next digit of the result. 
Result so far: 12858.4
Subtracting 308 from 360 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 8:
If we divide 520 by 77, we get 6 and a remainder of 58.
Use 6 as the next digit of our solution. 
Result so far: 12858.46
The remainder is 58 after subtracting 462 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 9:
77 can be fit into 580 7 times, resulting in a remainder of 41.
The next digit of our result is 7. 
Result so far: 12858.467
Subtract 539 from 580 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 10:
When dividing 410 by 77, we get 5 with a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 12858.4675
If we subtract 385 from 410, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 11:
The number 77 fits into 250 3 times, leaving a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 12858.46753
Subtract 231 from 250 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 12:
77 goes into 190 2 times with a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 12858.467532
The remainder is 36 after subtracting 154 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
77 goes into 360 4 times with a remainder of 52.
Write down 4 as next digit of the result. 
Result so far: 12858.4675324
The remainder is 52 after subtracting 308 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 14:
When dividing 520 by 77, we get 6 with a remainder of 58.
Record the quotient 6 as the next digit in the result. 
Result so far: 12858.46753246
If we subtract 462 from 520, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

The final outcome is 12858.46753246, with a leftover of 5.8e-08.