Let's divide 21434770 by 991
The aim is to understand the frequency of 991 in 21434770.

Advancing to step 1:
991 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 991

Going ahead to step 2:
The number 991 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Fetch the next digit (4) from the dividend, attach it to 21 and continue: 214 / 991

Going ahead to step 3:
214 divided by 991 is 0 with a remainder of 214.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 214 to get 214.
Take the next digit (3) from the dividend and append it to 214, then repeat: 2143 / 991

On to step 4:
991 can be fit into 2143 2 times, resulting in a remainder of 161.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 161 after subtracting 1982 from 2143.
Grab the next digit (4) from the dividend, add it to 161, then carry on: 1614 / 991

Going ahead to step 5:
991 goes into 1614 1 times with a remainder of 623.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we subtract 991 from 1614, we get 623.
Grab the next digit (7) from the dividend, add it to 623, then carry on: 6237 / 991

Going ahead to step 6:
When dividing 6237 by 991, we get 6 with a remainder of 291.
The number 6 becomes the next digit in our result. 
Result so far: 216.0
If we subtract 5946 from 6237, we get 291.
Grab the next digit (7) from the dividend, add it to 291, then carry on: 2917 / 991

Step 7:
991 can be fit into 2917 2 times, resulting in a remainder of 935.
Write down 2 as next digit of the result. 
Result so far: 2162.0
Subtract 1982 from 2917 to get 935.
Append the next digit (0) from the dividend to 935 and continue with: 9350 / 991

Advancing to step 8:
991 goes into 9350 9 times with a remainder of 431.
Use 9 as the next digit of our solution. 
Result so far: 21629.0
If we subtract 8919 from 9350, we get 431.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4310, and continue the process.

Step 9:
991 can be fit into 4310 4 times, resulting in a remainder of 346.
The next digit of our result is 4. 
Result so far: 21629.4
If we take 3964 away from 4310, we end up with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Let's proceed to step 10:
3460 divided by 991 is 3 with a remainder of 487.
Write down 3 as next digit of the result. 
Result so far: 21629.43
Deduct 2973 from 3460 and we're left with 487.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

Step 11:
991 goes into 4870 4 times with a remainder of 906.
Use 4 as the next digit of our solution. 
Result so far: 21629.434
The remainder is 906 after subtracting 3964 from 4870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9060, and continue the process.

Step 12:
991 goes into 9060 9 times with a remainder of 141.
Put 9 as the next digit of the answer. 
Result so far: 21629.4349
Deduct 8919 from 9060 and we're left with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Step 13:
991 can be fit into 1410 1 times, resulting in a remainder of 419.
Record the quotient 1 as the next digit in the result. 
Result so far: 21629.43491
Deduct 991 from 1410 and we're left with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Going ahead to step 14:
If we divide 4190 by 991, we get 4 and a remainder of 226.
The next digit of our result is 4. 
Result so far: 21629.434914
If we subtract 3964 from 4190, we get 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Let's proceed to step 15:
When dividing 2260 by 991, we get 2 with a remainder of 278.
Put 2 as the next digit of the answer. 
Result so far: 21629.4349142
Deduct 1982 from 2260 and we're left with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Going ahead to step 16:
When dividing 2780 by 991, we get 2 with a remainder of 798.
The number 2 becomes the next digit in our result. 
Result so far: 21629.43491422
Subtract 1982 from 2780 to get 798.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7980, and continue the process.

The quotient of the division is 21629.43491422, and the remainder is 7.98e-07.