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Math Playground for Teachers
Number Invaders are descending upon the friendly inhabitants of a distant planet.
You'll need instant recall of math facts and a steady hand to keep them away!
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Number Invaders Addition - Learning Connections
Essential Skills
Mental Math - add and subtract numbers by memory or through other efficient methods

Common Core Connection for Grades 1 and 2
Know from memory all sums of two one-digit numbers.
Apply properties of operations as strategies to add and subtract.
Fluently add and subtract within 20.
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