We're dividing 72428229 by 161 
The aim is to understand the frequency of 161 in 72428229.

Going ahead to step 1:
161 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 161

Let's proceed to step 2:
If we divide 72 by 161, we get 0 and a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Take the next digit (4) from the dividend and append it to 72, then repeat: 724 / 161

On to step 3:
724 divided by 161 is 4 with a remainder of 80.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 644 from 724 to get 80.
Include the next digit (2) from the dividend after 80, then repeat: 802 / 161

Moving on to step 4:
The number 161 fits into 802 4 times, leaving a remainder of 158.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.0
If we subtract 644 from 802, we get 158.
Take the next digit (8) from the dividend and append it to 158, then repeat: 1588 / 161

Step 5:
161 goes into 1588 9 times with a remainder of 139.
The next digit of our result is 9. 
Result so far: 449.0
Subtracting 1449 from 1588 leaves us with 139.
Bring next digit (2) of the dividend behind the 139 and repeat the process: 1392 / 161

Going ahead to step 6:
If we divide 1392 by 161, we get 8 and a remainder of 104.
The number 8 becomes the next digit in our result. 
Result so far: 4498.0
Subtracting 1288 from 1392 leaves us with 104.
Grab the next digit (2) from the dividend, add it to 104, then carry on: 1042 / 161

Advancing to step 7:
161 can be fit into 1042 6 times, resulting in a remainder of 76.
Write down 6 as next digit of the result. 
Result so far: 44986.0
Subtracting 966 from 1042 leaves us with 76.
Take the next digit (9) from the dividend and append it to 76, then repeat: 769 / 161

Step 8:
The number 161 fits into 769 4 times, leaving a remainder of 125.
The number 4 becomes the next digit in our result. 
Result so far: 449864.0
Subtract 644 from 769 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Moving on to step 9:
1250 divided by 161 is 7 with a remainder of 123.
The next digit of our result is 7. 
Result so far: 449864.7
Deduct 1127 from 1250 and we're left with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Going ahead to step 10:
When dividing 1230 by 161, we get 7 with a remainder of 103.
Record the quotient 7 as the next digit in the result. 
Result so far: 449864.77
Subtract 1127 from 1230 to get 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

The quotient of the division is 449864.77, and the remainder is 0.103.