Let's divide 83521599 by 450
The aim is to understand the frequency of 450 in 83521599.

Moving on to step 1:
The number 450 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 450

On to step 2:
450 can be fit into 83 0 times, resulting in a remainder of 83.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 83, we end up with 83.
Include the next digit (5) from the dividend after 83, then repeat: 835 / 450

Let's proceed to step 3:
If we divide 835 by 450, we get 1 and a remainder of 385.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 450 from 835 leaves us with 385.
Include the next digit (2) from the dividend after 385, then repeat: 3852 / 450

Step 4:
When dividing 3852 by 450, we get 8 with a remainder of 252.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
The remainder is 252 after subtracting 3600 from 3852.
Append the next digit (1) from the dividend to 252 and continue with: 2521 / 450

On to step 5:
2521 divided by 450 is 5 with a remainder of 271.
The number 5 becomes the next digit in our result. 
Result so far: 185.0
The remainder is 271 after subtracting 2250 from 2521.
Grab the next digit (5) from the dividend, add it to 271, then carry on: 2715 / 450

Advancing to step 6:
When dividing 2715 by 450, we get 6 with a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 1856.0
Subtract 2700 from 2715 to get 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 450

Let's proceed to step 7:
450 can be fit into 159 0 times, resulting in a remainder of 159.
Put 0 as the next digit of the answer. 
Result so far: 18560.0
Deduct 0 from 159 and we're left with 159.
Fetch the next digit (9) from the dividend, attach it to 159 and continue: 1599 / 450

Moving on to step 8:
When dividing 1599 by 450, we get 3 with a remainder of 249.
Put 3 as the next digit of the answer. 
Result so far: 185603.0
Subtract 1350 from 1599 to get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Step 9:
The number 450 fits into 2490 5 times, leaving a remainder of 240.
The number 5 becomes the next digit in our result. 
Result so far: 185603.5
Deduct 2250 from 2490 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 10:
450 can be fit into 2400 5 times, resulting in a remainder of 150.
Write down 5 as next digit of the result. 
Result so far: 185603.55
If we subtract 2250 from 2400, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The final outcome is 185603.55, with a leftover of 0.15.