We look at the division of 77610246 by 997 
The aim is to understand the frequency of 997 in 77610246.

On to step 1:
The number 997 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 997

On to step 2:
997 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Fetch the next digit (6) from the dividend, attach it to 77 and continue: 776 / 997

Going ahead to step 3:
997 goes into 776 0 times with a remainder of 776.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 776 and we're left with 776.
Bring next digit (1) of the dividend behind the 776 and repeat the process: 7761 / 997

Moving on to step 4:
The number 997 fits into 7761 7 times, leaving a remainder of 782.
Write down 7 as next digit of the result. 
Result so far: 7.0
Deduct 6979 from 7761 and we're left with 782.
Append the next digit (0) from the dividend to 782 and continue with: 7820 / 997

Going ahead to step 5:
When dividing 7820 by 997, we get 7 with a remainder of 841.
Put 7 as the next digit of the answer. 
Result so far: 77.0
If we take 6979 away from 7820, we end up with 841.
Take the next digit (2) from the dividend and append it to 841, then repeat: 8412 / 997

Moving on to step 6:
997 can be fit into 8412 8 times, resulting in a remainder of 436.
The number 8 becomes the next digit in our result. 
Result so far: 778.0
The remainder is 436 after subtracting 7976 from 8412.
Take the next digit (4) from the dividend and append it to 436, then repeat: 4364 / 997

Going ahead to step 7:
When dividing 4364 by 997, we get 4 with a remainder of 376.
Record the quotient 4 as the next digit in the result. 
Result so far: 7784.0
The remainder is 376 after subtracting 3988 from 4364.
Grab the next digit (6) from the dividend, add it to 376, then carry on: 3766 / 997

Advancing to step 8:
997 goes into 3766 3 times with a remainder of 775.
The number 3 becomes the next digit in our result. 
Result so far: 77843.0
The remainder is 775 after subtracting 2991 from 3766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7750, and continue the process.

Advancing to step 9:
7750 divided by 997 is 7 with a remainder of 771.
The number 7 becomes the next digit in our result. 
Result so far: 77843.7
If we take 6979 away from 7750, we end up with 771.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7710, and continue the process.

Step 10:
7710 divided by 997 is 7 with a remainder of 731.
Put 7 as the next digit of the answer. 
Result so far: 77843.77
If we take 6979 away from 7710, we end up with 731.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7310, and continue the process.

The quotient of the division is 77843.77, and the remainder is 0.731.