# 2.1 Adding, Subtracting, and Working with Data

## Unit Goals

- Students represent and solve story problems within 20 through the context of picture and bar graphs that represent categorical data. Students build toward fluency with addition and subtraction.

### Section A Goals

- Build toward fluency with adding within 100.
- Build toward fluency with subtracting within 20.

### Section B Goals

- Interpret picture and bar graphs.
- Represent data using picture and bar graphs.
- Solve one- and two-step problems using addition and subtraction within 20.

### Section C Goals

- Make sense of and interpret tape diagrams.
- Represent and solve Compare problems with unknowns in all positions within 100.

### Glossary Entries

**bar graph**A way to show how many in each group or category using the length of rectangles.**data**Information about the things or people in a group.

Example: If you have a box of colored pencils, then the lengths and colors of each of the pencils are data about the pencils in the box.**picture graph**A way to show how many in each group or category using pictures of the objects or symbols.