# Dinosaur Books

Derek loves to collect books about dinosaurs. Derek has seven dinosaur books. Derek wants to have ten dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

### More Accessible Version

Derek loves to collect books about dinosaurs. Derek has two dinosaur books. Derek wants to have five dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

### More Challenging Version

Derek loves to collect books about dinosaurs. Derek has seventeen dinosaur books. Derek wants to have twenty dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

## 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 frame, graph paper, etc. as they work on a task.

### Suggested materials

Engagement Image:

Teachers may project the image below to launch this task for their students, define nouns, promote discussion, access prior knowledge, and inspire engagement and problem solving.