Final answer:
Class 3 has raised a total of $738 by combining their bake sale and plant sale earnings. The new smart board costs $925, so they need an additional $187 to make the purchase.
Step-by-step explanation:
The question involves a simple calculation related to fundraising and cost management, so it falls under the subject of Mathematics. Specifically, this is a problem that involves addition and subtraction to find out how much more money class 3 needs to raise to purchase the new smart board.
Class 3 has already raised $438 from a bake sale and $300 from a plant sale. To find the total amount raised so far, we add these two amounts together:
- $438 (from bake sale) + $300 (from plant sale) = $738 (total raised so far).
The cost of the new smart board is $925. To find out how much more money class 3 needs, we subtract the total amount raised from the cost of the smart board:
- $925 (cost of smart board) - $738 (total raised so far) = $187.
Therefore, class 3 needs $187 more to buy the new smart board.