**Title:** Free Puzzles

**Description:**
Free Puzzles is a website that contains a wide variety of interactive mathematics puzzles.

**Standard(s): **

[MA2013] (6) 3: Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations. [6-RP3]

[MA2013] (6) 29: Summarize numerical data sets in relation to their context, such as by: [6-SP5]

[MA2013] (8) 6: Perform operations with numbers expressed in scientific notation, including problems where both decimal and scientific notation are used. Use scientific notation and choose units of appropriate size for measurements of very large or very small quantities (e.g., use millimeters per year for seafloor spreading). Interpret scientific notation that has been generated by technology. [8-EE4]