We're dividing 77217201 by 215 
The aim is to understand the frequency of 215 in 77217201.

Advancing to step 1:
When dividing 7 by 215, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 215

Advancing to step 2:
215 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 77 and we're left with 77.
Grab the next digit (2) from the dividend, add it to 77, then carry on: 772 / 215

Step 3:
When dividing 772 by 215, we get 3 with a remainder of 127.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 645 from 772 leaves us with 127.
Take the next digit (1) from the dividend and append it to 127, then repeat: 1271 / 215

Advancing to step 4:
If we divide 1271 by 215, we get 5 and a remainder of 196.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
If we take 1075 away from 1271, we end up with 196.
Grab the next digit (7) from the dividend, add it to 196, then carry on: 1967 / 215

Going ahead to step 5:
1967 divided by 215 is 9 with a remainder of 32.
Write down 9 as next digit of the result. 
Result so far: 359.0
If we take 1935 away from 1967, we end up with 32.
Take the next digit (2) from the dividend and append it to 32, then repeat: 322 / 215

Step 6:
215 can be fit into 322 1 times, resulting in a remainder of 107.
The number 1 becomes the next digit in our result. 
Result so far: 3591.0
Subtract 215 from 322 to get 107.
Take the next digit (0) from the dividend and append it to 107, then repeat: 1070 / 215

Let's proceed to step 7:
The number 215 fits into 1070 4 times, leaving a remainder of 210.
The next digit of our result is 4. 
Result so far: 35914.0
If we take 860 away from 1070, we end up with 210.
Grab the next digit (1) from the dividend, add it to 210, then carry on: 2101 / 215

Step 8:
215 goes into 2101 9 times with a remainder of 166.
The number 9 becomes the next digit in our result. 
Result so far: 359149.0
Subtracting 1935 from 2101 leaves us with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Going ahead to step 9:
If we divide 1660 by 215, we get 7 and a remainder of 155.
Put 7 as the next digit of the answer. 
Result so far: 359149.7
If we take 1505 away from 1660, we end up with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Moving on to step 10:
215 can be fit into 1550 7 times, resulting in a remainder of 45.
The next digit of our result is 7. 
Result so far: 359149.77
Subtract 1505 from 1550 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The quotient of the division is 359149.77, and the remainder is 0.045.