Final answer:
To determine the number of new whiteboards needed, multiply the number of classes by the number of pupils in each class. In this case, 3 classes with 28 children in each class would require 84 new whiteboards.
Step-by-step explanation:
To determine the number of new whiteboards needed, we need to multiply the number of classes by the number of pupils in each class. Since there are 3 classes and 28 children in each class, we can multiply these two values together:
Number of new whiteboards needed = Number of classes × Number of pupils in each class
Number of new whiteboards needed = 3 × 28 = 84
Therefore, 84 new whiteboards are needed for the new Year Three pupils.