86421702 ÷ 120 
The aim is to understand the frequency of 120 in 86421702.

Moving on to step 1:
If we divide 8 by 120, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 120

On to step 2:
The number 120 fits into 86 0 times, leaving a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Grab the next digit (4) from the dividend, add it to 86, then carry on: 864 / 120

On to step 3:
When dividing 864 by 120, we get 7 with a remainder of 24.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 24 after subtracting 840 from 864.
Take the next digit (2) from the dividend and append it to 24, then repeat: 242 / 120

Step 4:
The number 120 fits into 242 2 times, leaving a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 72.0
Deduct 240 from 242 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 120

Going ahead to step 5:
21 divided by 120 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 720.0
Subtracting 0 from 21 leaves us with 21.
Bring next digit (7) of the dividend behind the 21 and repeat the process: 217 / 120

Step 6:
120 can be fit into 217 1 times, resulting in a remainder of 97.
Write down 1 as next digit of the result. 
Result so far: 7201.0
Deduct 120 from 217 and we're left with 97.
Append the next digit (0) from the dividend to 97 and continue with: 970 / 120

On to step 7:
120 can be fit into 970 8 times, resulting in a remainder of 10.
The next digit of our result is 8. 
Result so far: 72018.0
The remainder is 10 after subtracting 960 from 970.
Bring next digit (2) of the dividend behind the 10 and repeat the process: 102 / 120

Advancing to step 8:
If we divide 102 by 120, we get 0 and a remainder of 102.
The number 0 becomes the next digit in our result. 
Result so far: 720180.0
If we subtract 0 from 102, we get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Moving on to step 9:
1020 divided by 120 is 8 with a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 720180.8
The remainder is 60 after subtracting 960 from 1020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 10:
The number 120 fits into 600 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 720180.85
Subtract 600 from 600 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
The number 120 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 720180.85
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
120 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 720180.85
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 720180.85 with a remainder of 0.0.