We look at the division of 37697218 by 991 
The aim is to understand the frequency of 991 in 37697218.

On to step 1:
991 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 991

Let's proceed to step 2:
991 goes into 37 0 times with a remainder of 37.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 37 and we're left with 37.
Fetch the next digit (6) from the dividend, attach it to 37 and continue: 376 / 991

Moving on to step 3:
If we divide 376 by 991, we get 0 and a remainder of 376.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 376 leaves us with 376.
Bring next digit (9) of the dividend behind the 376 and repeat the process: 3769 / 991

Moving on to step 4:
991 can be fit into 3769 3 times, resulting in a remainder of 796.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 796 after subtracting 2973 from 3769.
Bring next digit (7) of the dividend behind the 796 and repeat the process: 7967 / 991

Going ahead to step 5:
If we divide 7967 by 991, we get 8 and a remainder of 39.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
If we take 7928 away from 7967, we end up with 39.
Bring next digit (2) of the dividend behind the 39 and repeat the process: 392 / 991

Advancing to step 6:
If we divide 392 by 991, we get 0 and a remainder of 392.
Put 0 as the next digit of the answer. 
Result so far: 380.0
If we take 0 away from 392, we end up with 392.
Bring next digit (1) of the dividend behind the 392 and repeat the process: 3921 / 991

Step 7:
991 goes into 3921 3 times with a remainder of 948.
Use 3 as the next digit of our solution. 
Result so far: 3803.0
If we take 2973 away from 3921, we end up with 948.
Grab the next digit (8) from the dividend, add it to 948, then carry on: 9488 / 991

Going ahead to step 8:
If we divide 9488 by 991, we get 9 and a remainder of 569.
Record the quotient 9 as the next digit in the result. 
Result so far: 38039.0
Subtracting 8919 from 9488 leaves us with 569.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5690, and continue the process.

On to step 9:
The number 991 fits into 5690 5 times, leaving a remainder of 735.
The number 5 becomes the next digit in our result. 
Result so far: 38039.5
Deduct 4955 from 5690 and we're left with 735.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7350, and continue the process.

On to step 10:
When dividing 7350 by 991, we get 7 with a remainder of 413.
Write down 7 as next digit of the result. 
Result so far: 38039.57
The remainder is 413 after subtracting 6937 from 7350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4130, and continue the process.

Step 11:
When dividing 4130 by 991, we get 4 with a remainder of 166.
The next digit of our result is 4. 
Result so far: 38039.574
The remainder is 166 after subtracting 3964 from 4130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Advancing to step 12:
991 goes into 1660 1 times with a remainder of 669.
The next digit of our result is 1. 
Result so far: 38039.5741
If we take 991 away from 1660, we end up with 669.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6690, and continue the process.

Moving on to step 13:
6690 divided by 991 is 6 with a remainder of 744.
Put 6 as the next digit of the answer. 
Result so far: 38039.57416
The remainder is 744 after subtracting 5946 from 6690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Let's proceed to step 14:
If we divide 7440 by 991, we get 7 and a remainder of 503.
Put 7 as the next digit of the answer. 
Result so far: 38039.574167
Subtract 6937 from 7440 to get 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

Moving on to step 15:
If we divide 5030 by 991, we get 5 and a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 38039.5741675
If we subtract 4955 from 5030, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 16:
750 divided by 991 is 0 with a remainder of 750.
The number 0 becomes the next digit in our result. 
Result so far: 38039.5741675
Subtract 0 from 750 to get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

The quotient of the division is 38039.5741675, and the remainder is 7.5e-07.