We look at the division of 840070 by 90 
We want to figure out the number of times 840070 can be divided by 90.

On to step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 90

Step 2:
If we divide 84 by 90, we get 0 and a remainder of 84.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 84 after subtracting 0 from 84.
Include the next digit (0) from the dividend after 84, then repeat: 840 / 90

Let's proceed to step 3:
90 goes into 840 9 times with a remainder of 30.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 810 from 840 leaves us with 30.
Bring next digit (0) of the dividend behind the 30 and repeat the process: 300 / 90

Let's proceed to step 4:
If we divide 300 by 90, we get 3 and a remainder of 30.
The next digit of our result is 3. 
Result so far: 93.0
If we take 270 away from 300, we end up with 30.
Bring next digit (7) of the dividend behind the 30 and repeat the process: 307 / 90

Let's proceed to step 5:
90 goes into 307 3 times with a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 933.0
Subtracting 270 from 307 leaves us with 37.
Include the next digit (0) from the dividend after 37, then repeat: 370 / 90

On to step 6:
90 goes into 370 4 times with a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 9334.0
Subtract 360 from 370 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
When dividing 100 by 90, we get 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 9334.1
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
90 goes into 100 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 9334.11
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 9334.11, with a leftover of 0.01.