Final answer:
You need an additional $4.57 to buy the magazine after subtracting the amount you have saved ($2.82) from the total cost of the magazine ($7.39).
Step-by-step explanation:
The question involves estimating the difference between two decimal numbers, $7.39 (the cost of the magazine) and $2.82 (the amount of money you have saved). To estimate how much more money is needed to buy the magazine, follow these steps:
Consider the amount needed: $7.39.
Consider the amount saved: $2.82.
Subtract the amount saved from the amount needed to find the difference: $7.39 - $2.82 = $4.57.
This means you need an additional $4.57 to purchase the magazine. This is a basic subtraction problem with decimals, which is a common topic in middle school math.