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This activity addresses CCSS.Math.Content.1.OA.A.2 Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.
It also supports EngageNY First Grade Math Module 2 Lessons 1 & 2
Solve the 3 digit addition problems and color by code
Adding 3 Numbers
by Stephanie Swims
is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License