We look at the division of 77770991 by 216 
We're looking to find how many times 216 goes into 77770991.

Going ahead to step 1:
216 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 216

Moving on to step 2:
The number 216 fits into 77 0 times, leaving a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Take the next digit (7) from the dividend and append it to 77, then repeat: 777 / 216

Advancing to step 3:
216 goes into 777 3 times with a remainder of 129.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 648 from 777, we get 129.
Grab the next digit (7) from the dividend, add it to 129, then carry on: 1297 / 216

Advancing to step 4:
When dividing 1297 by 216, we get 6 with a remainder of 1.
The next digit of our result is 6. 
Result so far: 36.0
If we take 1296 away from 1297, we end up with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 216

Going ahead to step 5:
216 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 360.0
Deduct 0 from 10 and we're left with 10.
Bring next digit (9) of the dividend behind the 10 and repeat the process: 109 / 216

Moving on to step 6:
The number 216 fits into 109 0 times, leaving a remainder of 109.
The number 0 becomes the next digit in our result. 
Result so far: 3600.0
Subtract 0 from 109 to get 109.
Grab the next digit (9) from the dividend, add it to 109, then carry on: 1099 / 216

Advancing to step 7:
1099 divided by 216 is 5 with a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 36005.0
Deduct 1080 from 1099 and we're left with 19.
Grab the next digit (1) from the dividend, add it to 19, then carry on: 191 / 216

On to step 8:
If we divide 191 by 216, we get 0 and a remainder of 191.
Record the quotient 0 as the next digit in the result. 
Result so far: 360050.0
If we take 0 away from 191, we end up with 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

Advancing to step 9:
1910 divided by 216 is 8 with a remainder of 182.
The number 8 becomes the next digit in our result. 
Result so far: 360050.8
The remainder is 182 after subtracting 1728 from 1910.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Step 10:
The number 216 fits into 1820 8 times, leaving a remainder of 92.
Record the quotient 8 as the next digit in the result. 
Result so far: 360050.88
Deduct 1728 from 1820 and we're left with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

The quotient of the division is 360050.88, and the remainder is 0.092.