The tenth place is the first number to the right of the decimal, in this case, it is 5. In order to know whether or not to raise it to 6 or keep it as 5, we have to look at the hundredth's value. If the number is 5 or higher, we change 5 to 6. If the number is 4 or lower, we keep the 5. In this case, the number is 3, which is 4 or lower. We keep the 5 as it is and get rid off all the numbers behind it. Resulting in:
First find out how much money she spent by doing 80 (original amount) - 33.56 (amount after spending): $46.44 Now she spent 46.44 dollars and each pound is 7.74: 46.44 / 7.74 = 6 She bought 6 lbs