Dinosaurs

Danny has eighteen plastic dinosaurs. Danny gives nine of his plastic dinosaurs to Lucas. How many plastic dinosaurs does Danny keep for himself? Show all your mathematical thinking.

Instructional

More Accessible Version

Danny has nine plastic dinosaurs. Danny gives four of his plastic dinosaurs to Lucas. How many plastic dinosaurs does Danny keep for himself? Show all your mathematical thinking.

More Challenging Version

Danny has twenty-one plastic dinosaurs. Danny gives nine of his plastic dinosaurs to Lucas. Danny gives three of his plastic dinosaurs to Amy. How many plastic dinosaurs does Danny keep for himself? Show all your mathematical thinking.

Plan

Underlying Mathematical Concepts

Possible Problem-Solving Strategies

Formal Mathematical Language and Symbolic Notation

A student may independently select a printed number line, number chart, ten frames, graph paper, etc. as they work on a task.

Possible Solutions

Solutions tabs

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