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Here's a terrific reference sheet for inclusion in math notebook! Must print these!

A Year Full of Kindergarten Lessons for Understanding Addition and Subtraction

Kindergartners add the two sides of a domino and then put it on the matching plywood square. GREAT for seeing all of the combinations to twelve!

Sunny Days in Second Grade: kids take shapes (they had lots of different ones available) and paste some on the front under a word problem they write and paste some that will be hidden by the black flap. They also write an addition problem with an unknown to reinforce that skill as well. Then students can switch and try to figure out their partner's problem.