We're dividing 70990394 by 815 
Let's see how many times 815 fits into 70990394.

Step 1:
The number 815 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 815

On to step 2:
When dividing 70 by 815, we get 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 70 after subtracting 0 from 70.
Append the next digit (9) from the dividend to 70 and continue with: 709 / 815

Moving on to step 3:
When dividing 709 by 815, we get 0 with a remainder of 709.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 709 leaves us with 709.
Append the next digit (9) from the dividend to 709 and continue with: 7099 / 815

On to step 4:
7099 divided by 815 is 8 with a remainder of 579.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 6520 from 7099 to get 579.
Grab the next digit (0) from the dividend, add it to 579, then carry on: 5790 / 815

Advancing to step 5:
815 goes into 5790 7 times with a remainder of 85.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
The remainder is 85 after subtracting 5705 from 5790.
Include the next digit (3) from the dividend after 85, then repeat: 853 / 815

Advancing to step 6:
815 can be fit into 853 1 times, resulting in a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 871.0
Subtracting 815 from 853 leaves us with 38.
Fetch the next digit (9) from the dividend, attach it to 38 and continue: 389 / 815

Advancing to step 7:
When dividing 389 by 815, we get 0 with a remainder of 389.
The next digit of our result is 0. 
Result so far: 8710.0
Subtract 0 from 389 to get 389.
Take the next digit (4) from the dividend and append it to 389, then repeat: 3894 / 815

Advancing to step 8:
815 can be fit into 3894 4 times, resulting in a remainder of 634.
Write down 4 as next digit of the result. 
Result so far: 87104.0
The remainder is 634 after subtracting 3260 from 3894.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6340, and continue the process.

Advancing to step 9:
815 goes into 6340 7 times with a remainder of 635.
The next digit of our result is 7. 
Result so far: 87104.7
The remainder is 635 after subtracting 5705 from 6340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

Step 10:
6350 divided by 815 is 7 with a remainder of 645.
Write down 7 as next digit of the result. 
Result so far: 87104.77
Deduct 5705 from 6350 and we're left with 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

In conclusion, the division gives 87104.77 with a balance of 0.645.