We're dividing 870329 by 15 
The aim is to understand the frequency of 15 in 870329.

Moving on to step 1:
The number 15 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 15

Advancing to step 2:
If we divide 87 by 15, we get 5 and a remainder of 12.
The next digit of our result is 5. 
Result so far: 5.0
If we subtract 75 from 87, we get 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 15

Advancing to step 3:
120 divided by 15 is 8 with a remainder of 0.
The next digit of our result is 8. 
Result so far: 58.0
If we subtract 120 from 120, we get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 15

Going ahead to step 4:
3 divided by 15 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 580.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 15

Advancing to step 5:
If we divide 32 by 15, we get 2 and a remainder of 2.
The next digit of our result is 2. 
Result so far: 5802.0
Subtracting 30 from 32 leaves us with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 15

Moving on to step 6:
When dividing 29 by 15, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 58021.0
Deduct 15 from 29 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
The number 15 fits into 140 9 times, leaving a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 58021.9
Subtract 135 from 140 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
The next digit of our result is 3. 
Result so far: 58021.93
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
15 goes into 50 3 times with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 58021.933
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 58021.933, and the remainder is 0.0005.