97878080 ÷ 688 
The aim is to understand the frequency of 688 in 97878080.

Step 1:
If we divide 9 by 688, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (7) from the dividend, attach it to 9 and continue: 97 / 688

Step 2:
If we divide 97 by 688, we get 0 and a remainder of 97.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 97 to get 97.
Grab the next digit (8) from the dividend, add it to 97, then carry on: 978 / 688

Advancing to step 3:
When dividing 978 by 688, we get 1 with a remainder of 290.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 688 from 978 and we're left with 290.
Fetch the next digit (7) from the dividend, attach it to 290 and continue: 2907 / 688

Let's proceed to step 4:
2907 divided by 688 is 4 with a remainder of 155.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 2752 from 2907 to get 155.
Take the next digit (8) from the dividend and append it to 155, then repeat: 1558 / 688

Going ahead to step 5:
If we divide 1558 by 688, we get 2 and a remainder of 182.
Write down 2 as next digit of the result. 
Result so far: 142.0
Subtracting 1376 from 1558 leaves us with 182.
Take the next digit (0) from the dividend and append it to 182, then repeat: 1820 / 688

Let's proceed to step 6:
When dividing 1820 by 688, we get 2 with a remainder of 444.
Record the quotient 2 as the next digit in the result. 
Result so far: 1422.0
The remainder is 444 after subtracting 1376 from 1820.
Include the next digit (8) from the dividend after 444, then repeat: 4448 / 688

Step 7:
4448 divided by 688 is 6 with a remainder of 320.
The number 6 becomes the next digit in our result. 
Result so far: 14226.0
If we subtract 4128 from 4448, we get 320.
Append the next digit (0) from the dividend to 320 and continue with: 3200 / 688

Going ahead to step 8:
If we divide 3200 by 688, we get 4 and a remainder of 448.
The number 4 becomes the next digit in our result. 
Result so far: 142264.0
Subtracting 2752 from 3200 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

On to step 9:
If we divide 4480 by 688, we get 6 and a remainder of 352.
Record the quotient 6 as the next digit in the result. 
Result so far: 142264.6
Subtract 4128 from 4480 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 10:
If we divide 3520 by 688, we get 5 and a remainder of 80.
Put 5 as the next digit of the answer. 
Result so far: 142264.65
Subtracting 3440 from 3520 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 11:
If we divide 800 by 688, we get 1 and a remainder of 112.
Put 1 as the next digit of the answer. 
Result so far: 142264.651
Subtracting 688 from 800 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 12:
688 can be fit into 1120 1 times, resulting in a remainder of 432.
Write down 1 as next digit of the result. 
Result so far: 142264.6511
If we take 688 away from 1120, we end up with 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

The quotient of the division is 142264.6511, and the remainder is 0.00432.