75421720 divided by 439 
The aim is to understand the frequency of 439 in 75421720.

On to step 1:
The number 439 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 439

Let's proceed to step 2:
The number 439 fits into 75 0 times, leaving a remainder of 75.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 75 and we're left with 75.
Fetch the next digit (4) from the dividend, attach it to 75 and continue: 754 / 439

On to step 3:
439 goes into 754 1 times with a remainder of 315.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 315 after subtracting 439 from 754.
Include the next digit (2) from the dividend after 315, then repeat: 3152 / 439

Moving on to step 4:
439 goes into 3152 7 times with a remainder of 79.
The next digit of our result is 7. 
Result so far: 17.0
The remainder is 79 after subtracting 3073 from 3152.
Take the next digit (1) from the dividend and append it to 79, then repeat: 791 / 439

Let's proceed to step 5:
791 divided by 439 is 1 with a remainder of 352.
Record the quotient 1 as the next digit in the result. 
Result so far: 171.0
Subtract 439 from 791 to get 352.
Append the next digit (7) from the dividend to 352 and continue with: 3527 / 439

Let's proceed to step 6:
3527 divided by 439 is 8 with a remainder of 15.
Write down 8 as next digit of the result. 
Result so far: 1718.0
The remainder is 15 after subtracting 3512 from 3527.
Take the next digit (2) from the dividend and append it to 15, then repeat: 152 / 439

Going ahead to step 7:
439 can be fit into 152 0 times, resulting in a remainder of 152.
Use 0 as the next digit of our solution. 
Result so far: 17180.0
The remainder is 152 after subtracting 0 from 152.
Bring next digit (0) of the dividend behind the 152 and repeat the process: 1520 / 439

Let's proceed to step 8:
When dividing 1520 by 439, we get 3 with a remainder of 203.
Use 3 as the next digit of our solution. 
Result so far: 171803.0
If we take 1317 away from 1520, we end up with 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

Going ahead to step 9:
If we divide 2030 by 439, we get 4 and a remainder of 274.
Record the quotient 4 as the next digit in the result. 
Result so far: 171803.4
If we take 1756 away from 2030, we end up with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Step 10:
If we divide 2740 by 439, we get 6 and a remainder of 106.
Put 6 as the next digit of the answer. 
Result so far: 171803.46
Subtract 2634 from 2740 to get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Let's proceed to step 11:
When dividing 1060 by 439, we get 2 with a remainder of 182.
Put 2 as the next digit of the answer. 
Result so far: 171803.462
The remainder is 182 after subtracting 878 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Moving on to step 12:
439 goes into 1820 4 times with a remainder of 64.
Write down 4 as next digit of the result. 
Result so far: 171803.4624
If we subtract 1756 from 1820, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 13:
If we divide 640 by 439, we get 1 and a remainder of 201.
The next digit of our result is 1. 
Result so far: 171803.46241
The remainder is 201 after subtracting 439 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Let's proceed to step 14:
If we divide 2010 by 439, we get 4 and a remainder of 254.
Put 4 as the next digit of the answer. 
Result so far: 171803.462414
If we take 1756 away from 2010, we end up with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

On to step 15:
When dividing 2540 by 439, we get 5 with a remainder of 345.
The next digit of our result is 5. 
Result so far: 171803.4624145
Subtract 2195 from 2540 to get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Advancing to step 16:
When dividing 3450 by 439, we get 7 with a remainder of 377.
The number 7 becomes the next digit in our result. 
Result so far: 171803.46241457
The remainder is 377 after subtracting 3073 from 3450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

The final result is 171803.46241457 with a remainder of 3.77e-07.