Let's divide 53398856 by 721
The aim is to understand the frequency of 721 in 53398856.

Step 1:
If we divide 5 by 721, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 721

Step 2:
When dividing 53 by 721, we get 0 with a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Include the next digit (3) from the dividend after 53, then repeat: 533 / 721

Moving on to step 3:
If we divide 533 by 721, we get 0 and a remainder of 533.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 533 after subtracting 0 from 533.
Take the next digit (9) from the dividend and append it to 533, then repeat: 5339 / 721

Going ahead to step 4:
The number 721 fits into 5339 7 times, leaving a remainder of 292.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
The remainder is 292 after subtracting 5047 from 5339.
Grab the next digit (8) from the dividend, add it to 292, then carry on: 2928 / 721

Step 5:
The number 721 fits into 2928 4 times, leaving a remainder of 44.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Subtract 2884 from 2928 to get 44.
Fetch the next digit (8) from the dividend, attach it to 44 and continue: 448 / 721

Step 6:
If we divide 448 by 721, we get 0 and a remainder of 448.
Record the quotient 0 as the next digit in the result. 
Result so far: 740.0
Subtracting 0 from 448 leaves us with 448.
Include the next digit (5) from the dividend after 448, then repeat: 4485 / 721

Advancing to step 7:
721 goes into 4485 6 times with a remainder of 159.
Record the quotient 6 as the next digit in the result. 
Result so far: 7406.0
Subtracting 4326 from 4485 leaves us with 159.
Append the next digit (6) from the dividend to 159 and continue with: 1596 / 721

Let's proceed to step 8:
721 can be fit into 1596 2 times, resulting in a remainder of 154.
Put 2 as the next digit of the answer. 
Result so far: 74062.0
Deduct 1442 from 1596 and we're left with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Moving on to step 9:
If we divide 1540 by 721, we get 2 and a remainder of 98.
The next digit of our result is 2. 
Result so far: 74062.2
The remainder is 98 after subtracting 1442 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Step 10:
721 can be fit into 980 1 times, resulting in a remainder of 259.
Record the quotient 1 as the next digit in the result. 
Result so far: 74062.21
Subtract 721 from 980 to get 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Advancing to step 11:
721 can be fit into 2590 3 times, resulting in a remainder of 427.
Record the quotient 3 as the next digit in the result. 
Result so far: 74062.213
If we take 2163 away from 2590, we end up with 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

On to step 12:
721 goes into 4270 5 times with a remainder of 665.
Put 5 as the next digit of the answer. 
Result so far: 74062.2135
Subtracting 3605 from 4270 leaves us with 665.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6650, and continue the process.

Let's proceed to step 13:
6650 divided by 721 is 9 with a remainder of 161.
Record the quotient 9 as the next digit in the result. 
Result so far: 74062.21359
Deduct 6489 from 6650 and we're left with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Let's proceed to step 14:
If we divide 1610 by 721, we get 2 and a remainder of 168.
Use 2 as the next digit of our solution. 
Result so far: 74062.213592
If we take 1442 away from 1610, we end up with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Let's proceed to step 15:
721 goes into 1680 2 times with a remainder of 238.
Write down 2 as next digit of the result. 
Result so far: 74062.2135922
Subtracting 1442 from 1680 leaves us with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

After the division, we end up with 74062.2135922 and a remainder of 2.38e-06.