We look at the division of 67437805 by 721 
The aim is to understand the frequency of 721 in 67437805.

On to step 1:
721 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 721

Let's proceed to step 2:
721 can be fit into 67 0 times, resulting in a remainder of 67.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 67 after subtracting 0 from 67.
Append the next digit (4) from the dividend to 67 and continue with: 674 / 721

Let's proceed to step 3:
674 divided by 721 is 0 with a remainder of 674.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 674 leaves us with 674.
Bring next digit (3) of the dividend behind the 674 and repeat the process: 6743 / 721

Going ahead to step 4:
721 can be fit into 6743 9 times, resulting in a remainder of 254.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 6489 from 6743, we get 254.
Fetch the next digit (7) from the dividend, attach it to 254 and continue: 2547 / 721

On to step 5:
When dividing 2547 by 721, we get 3 with a remainder of 384.
Put 3 as the next digit of the answer. 
Result so far: 93.0
Subtracting 2163 from 2547 leaves us with 384.
Bring next digit (8) of the dividend behind the 384 and repeat the process: 3848 / 721

Let's proceed to step 6:
721 can be fit into 3848 5 times, resulting in a remainder of 243.
The number 5 becomes the next digit in our result. 
Result so far: 935.0
The remainder is 243 after subtracting 3605 from 3848.
Bring next digit (0) of the dividend behind the 243 and repeat the process: 2430 / 721

Moving on to step 7:
721 can be fit into 2430 3 times, resulting in a remainder of 267.
The number 3 becomes the next digit in our result. 
Result so far: 9353.0
If we subtract 2163 from 2430, we get 267.
Bring next digit (5) of the dividend behind the 267 and repeat the process: 2675 / 721

Moving on to step 8:
721 goes into 2675 3 times with a remainder of 512.
The next digit of our result is 3. 
Result so far: 93533.0
The remainder is 512 after subtracting 2163 from 2675.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

On to step 9:
721 goes into 5120 7 times with a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 93533.7
If we take 5047 away from 5120, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 10:
If we divide 730 by 721, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 93533.71
Deduct 721 from 730 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
When dividing 90 by 721, we get 0 with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 93533.71
Subtracting 0 from 90 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 12:
When dividing 900 by 721, we get 1 with a remainder of 179.
The number 1 becomes the next digit in our result. 
Result so far: 93533.7101
If we take 721 away from 900, we end up with 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Going ahead to step 13:
When dividing 1790 by 721, we get 2 with a remainder of 348.
Write down 2 as next digit of the result. 
Result so far: 93533.71012
If we subtract 1442 from 1790, we get 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Going ahead to step 14:
721 goes into 3480 4 times with a remainder of 596.
Write down 4 as next digit of the result. 
Result so far: 93533.710124
If we subtract 2884 from 3480, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Step 15:
721 goes into 5960 8 times with a remainder of 192.
Write down 8 as next digit of the result. 
Result so far: 93533.7101248
If we take 5768 away from 5960, we end up with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Going ahead to step 16:
721 goes into 1920 2 times with a remainder of 478.
The number 2 becomes the next digit in our result. 
Result so far: 93533.71012482
Subtracting 1442 from 1920 leaves us with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Our division results in 93533.71012482 with a remaining 4.78e-07.