Exemplar 1st Grade Math Unit: Addition and Subtraction to 20
Aug 01, 2017 · 2.OA.2 Fluently add and subtract within 20 using mental strategies. By the end of grade 2, know from memory all sums of two one-digit numbers. 2.OA.4 Use addition to find the total number of objects arranged in a rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total sum of equal addends. Calendar ................
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