We look at the division of 76438960 by 90 
We want to figure out the number of times 76438960 can be divided by 90.

Moving on to step 1:
When dividing 7 by 90, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 90

Advancing to step 2:
90 goes into 76 0 times with a remainder of 76.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 76, we get 76.
Take the next digit (4) from the dividend and append it to 76, then repeat: 764 / 90

Let's proceed to step 3:
If we divide 764 by 90, we get 8 and a remainder of 44.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 44 after subtracting 720 from 764.
Bring next digit (3) of the dividend behind the 44 and repeat the process: 443 / 90

Moving on to step 4:
90 can be fit into 443 4 times, resulting in a remainder of 83.
Record the quotient 4 as the next digit in the result. 
Result so far: 84.0
Subtracting 360 from 443 leaves us with 83.
Bring next digit (8) of the dividend behind the 83 and repeat the process: 838 / 90

Advancing to step 5:
90 can be fit into 838 9 times, resulting in a remainder of 28.
The next digit of our result is 9. 
Result so far: 849.0
The remainder is 28 after subtracting 810 from 838.
Append the next digit (9) from the dividend to 28 and continue with: 289 / 90

Moving on to step 6:
289 divided by 90 is 3 with a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 8493.0
Deduct 270 from 289 and we're left with 19.
Append the next digit (6) from the dividend to 19 and continue with: 196 / 90

On to step 7:
When dividing 196 by 90, we get 2 with a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 84932.0
If we take 180 away from 196, we end up with 16.
Take the next digit (0) from the dividend and append it to 16, then repeat: 160 / 90

Step 8:
90 can be fit into 160 1 times, resulting in a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 849321.0
If we subtract 90 from 160, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 849321.7
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 10:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 849321.77
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 849321.77 and a remainder of 0.07.