We're dividing 129259 by 70 
The aim is to understand the frequency of 70 in 129259.

On to step 1:
If we divide 1 by 70, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 70

Advancing to step 2:
70 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 70

Step 3:
The number 70 fits into 129 1 times, leaving a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 70 from 129 to get 59.
Include the next digit (2) from the dividend after 59, then repeat: 592 / 70

Moving on to step 4:
592 divided by 70 is 8 with a remainder of 32.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Deduct 560 from 592 and we're left with 32.
Grab the next digit (5) from the dividend, add it to 32, then carry on: 325 / 70

Moving on to step 5:
325 divided by 70 is 4 with a remainder of 45.
Record the quotient 4 as the next digit in the result. 
Result so far: 184.0
If we take 280 away from 325, we end up with 45.
Bring next digit (9) of the dividend behind the 45 and repeat the process: 459 / 70

Moving on to step 6:
70 can be fit into 459 6 times, resulting in a remainder of 39.
The next digit of our result is 6. 
Result so far: 1846.0
Deduct 420 from 459 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 7:
The number 70 fits into 390 5 times, leaving a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 1846.5
Subtract 350 from 390 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
400 divided by 70 is 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 1846.55
Deduct 350 from 400 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 1846.55 and a remainder of 0.05.