![](https://images-assets.nasa.gov/image/GSFC_20171208_Archive_e001422/GSFC_20171208_Archive_e001422~large.jpg?w=1920&h=1500&fit=clip&crop=faces%2Cfocalpoint)
Audience
Educators
Grade Levels
Grades 5-8, Grades 9-12
Subject
Mathematics, Space Science, Algebra, Solar System and Planets, Sun
Type
Lesson Plans / Activities
Students evaluate simple expressions involving positive and negative numbers such as -3 (-12 + 9) to decode a crossword puzzle.
Problem 9, Space Weather Crossword [336KB PDF file]
This activity is part of Space Math I.