We look at the division of 78680983 by 654 
The aim is to understand the frequency of 654 in 78680983.

Step 1:
654 goes into 7 0 times with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 654

On to step 2:
654 can be fit into 78 0 times, resulting in a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Include the next digit (6) from the dividend after 78, then repeat: 786 / 654

Going ahead to step 3:
When dividing 786 by 654, we get 1 with a remainder of 132.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 654 from 786, we get 132.
Take the next digit (8) from the dividend and append it to 132, then repeat: 1328 / 654

Step 4:
1328 divided by 654 is 2 with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 1308 from 1328, we get 20.
Take the next digit (0) from the dividend and append it to 20, then repeat: 200 / 654

Going ahead to step 5:
If we divide 200 by 654, we get 0 and a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 120.0
Deduct 0 from 200 and we're left with 200.
Grab the next digit (9) from the dividend, add it to 200, then carry on: 2009 / 654

Going ahead to step 6:
654 goes into 2009 3 times with a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 1203.0
Subtract 1962 from 2009 to get 47.
Take the next digit (8) from the dividend and append it to 47, then repeat: 478 / 654

On to step 7:
654 goes into 478 0 times with a remainder of 478.
Write down 0 as next digit of the result. 
Result so far: 12030.0
Subtracting 0 from 478 leaves us with 478.
Grab the next digit (3) from the dividend, add it to 478, then carry on: 4783 / 654

Step 8:
654 goes into 4783 7 times with a remainder of 205.
Record the quotient 7 as the next digit in the result. 
Result so far: 120307.0
Subtract 4578 from 4783 to get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

On to step 9:
When dividing 2050 by 654, we get 3 with a remainder of 88.
The next digit of our result is 3. 
Result so far: 120307.3
The remainder is 88 after subtracting 1962 from 2050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 10:
654 goes into 880 1 times with a remainder of 226.
Record the quotient 1 as the next digit in the result. 
Result so far: 120307.31
If we subtract 654 from 880, we get 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

On to step 11:
If we divide 2260 by 654, we get 3 and a remainder of 298.
Use 3 as the next digit of our solution. 
Result so far: 120307.313
If we take 1962 away from 2260, we end up with 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Advancing to step 12:
654 can be fit into 2980 4 times, resulting in a remainder of 364.
Put 4 as the next digit of the answer. 
Result so far: 120307.3134
If we subtract 2616 from 2980, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Going ahead to step 13:
3640 divided by 654 is 5 with a remainder of 370.
Put 5 as the next digit of the answer. 
Result so far: 120307.31345
Deduct 3270 from 3640 and we're left with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Step 14:
The number 654 fits into 3700 5 times, leaving a remainder of 430.
Put 5 as the next digit of the answer. 
Result so far: 120307.313455
Deduct 3270 from 3700 and we're left with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

The final outcome is 120307.313455, with a leftover of 4.3e-05.