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!
Number Invaders Addition - Learning Connections
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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