77498077 ÷ 901 
The aim is to understand the frequency of 901 in 77498077.

On to step 1:
If we divide 7 by 901, we get 0 and 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.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 901

Moving on to step 2:
77 divided by 901 is 0 with a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 77 and we're left with 77.
Append the next digit (4) from the dividend to 77 and continue with: 774 / 901

On to step 3:
When dividing 774 by 901, we get 0 with a remainder of 774.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 774 after subtracting 0 from 774.
Grab the next digit (9) from the dividend, add it to 774, then carry on: 7749 / 901

Moving on to step 4:
901 can be fit into 7749 8 times, resulting in a remainder of 541.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 7208 from 7749 to get 541.
Append the next digit (8) from the dividend to 541 and continue with: 5418 / 901

Going ahead to step 5:
901 can be fit into 5418 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 86.0
Subtracting 5406 from 5418 leaves us with 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 901

Going ahead to step 6:
The number 901 fits into 120 0 times, leaving a remainder of 120.
Record the quotient 0 as the next digit in the result. 
Result so far: 860.0
If we take 0 away from 120, we end up with 120.
Bring next digit (7) of the dividend behind the 120 and repeat the process: 1207 / 901

On to step 7:
901 goes into 1207 1 times with a remainder of 306.
Record the quotient 1 as the next digit in the result. 
Result so far: 8601.0
The remainder is 306 after subtracting 901 from 1207.
Take the next digit (7) from the dividend and append it to 306, then repeat: 3067 / 901

Step 8:
901 can be fit into 3067 3 times, resulting in a remainder of 364.
The number 3 becomes the next digit in our result. 
Result so far: 86013.0
Subtracting 2703 from 3067 leaves us with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

On to step 9:
901 can be fit into 3640 4 times, resulting in a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 86013.4
Subtract 3604 from 3640 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 10:
360 divided by 901 is 0 with a remainder of 360.
Use 0 as the next digit of our solution. 
Result so far: 86013.4
If we take 0 away from 360, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 11:
3600 divided by 901 is 3 with a remainder of 897.
Write down 3 as next digit of the result. 
Result so far: 86013.403
Deduct 2703 from 3600 and we're left with 897.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8970, and continue the process.

Going ahead to step 12:
The number 901 fits into 8970 9 times, leaving a remainder of 861.
Put 9 as the next digit of the answer. 
Result so far: 86013.4039
If we subtract 8109 from 8970, we get 861.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8610, and continue the process.

Going ahead to step 13:
If we divide 8610 by 901, we get 9 and a remainder of 501.
Use 9 as the next digit of our solution. 
Result so far: 86013.40399
The remainder is 501 after subtracting 8109 from 8610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5010, and continue the process.

The final outcome is 86013.40399, with a leftover of 0.000501.