Consider the following story problem: Tom had 8 marbles. Mary gave him some more marbles. Now he has 13 marbles. How many marbles did Mary give him?
What will be an ideal response?
a. Correct answers can include changing the problem type to Part-part-whole or Compare (since problems involving action, such as Join and Separate, are easiest for children to solve by direct modeling, while Part-part-whole and Compare problems are more difficult to model) and using larger numbers. For example: Tom had 13 marbles. Five are blue and the rest are red. How many marbles are red?
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