Decagon
A decagon is a polygon with 10 sides and 10 angles. The sum of the interior angles in a decagon is 1440 degrees. Each interior angle in a regular decagon measures 144 degrees.
.◂Math Worksheets and Study Guides Third Grade. Adding Money
Study Guide
Adding Money 
Worksheet/Answer key
Adding Money Worksheet/Answer key
Adding Money Worksheet/Answer key
Adding Money Worksheet/Answer key
Adding Money
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The resources above cover the following skills:
Algebra (NCTM)
Use mathematical models to represent and understand quantitative relationships.
Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.