9980315 divided by 77 
The aim is to understand the frequency of 77 in 9980315.

On to step 1:
9 divided by 77 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 77

Moving on to step 2:
The number 77 fits into 99 1 times, leaving a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 77 from 99 and we're left with 22.
Append the next digit (8) from the dividend to 22 and continue with: 228 / 77

On to step 3:
228 divided by 77 is 2 with a remainder of 74.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 154 from 228, we get 74.
Bring next digit (0) of the dividend behind the 74 and repeat the process: 740 / 77

Let's proceed to step 4:
If we divide 740 by 77, we get 9 and a remainder of 47.
Put 9 as the next digit of the answer. 
Result so far: 129.0
The remainder is 47 after subtracting 693 from 740.
Bring next digit (3) of the dividend behind the 47 and repeat the process: 473 / 77

Advancing to step 5:
When dividing 473 by 77, we get 6 with a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 1296.0
Subtracting 462 from 473 leaves us with 11.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 77

Advancing to step 6:
111 divided by 77 is 1 with a remainder of 34.
Write down 1 as next digit of the result. 
Result so far: 12961.0
Subtracting 77 from 111 leaves us with 34.
Take the next digit (5) from the dividend and append it to 34, then repeat: 345 / 77

On to step 7:
345 divided by 77 is 4 with a remainder of 37.
Record the quotient 4 as the next digit in the result. 
Result so far: 129614.0
If we take 308 away from 345, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 8:
When dividing 370 by 77, we get 4 with a remainder of 62.
The number 4 becomes the next digit in our result. 
Result so far: 129614.4
Deduct 308 from 370 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 9:
If we divide 620 by 77, we get 8 and a remainder of 4.
The next digit of our result is 8. 
Result so far: 129614.48
If we take 616 away from 620, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
77 goes into 40 0 times with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 129614.48
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
When dividing 400 by 77, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 129614.4805
Subtracting 385 from 400 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
77 goes into 150 1 times with a remainder of 73.
Write down 1 as next digit of the result. 
Result so far: 129614.48051
Deduct 77 from 150 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 13:
If we divide 730 by 77, we get 9 and a remainder of 37.
Put 9 as the next digit of the answer. 
Result so far: 129614.480519
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 14:
If we divide 370 by 77, we get 4 and a remainder of 62.
The next digit of our result is 4. 
Result so far: 129614.4805194
Subtracting 308 from 370 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 15:
77 goes into 620 8 times with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 129614.48051948
Subtract 616 from 620 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 129614.48051948 with a balance of 4e-09.