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Note: There is no end to the questions. Just keep clicking to go through as many addition questions as you want.
The Addition and subtraction Flashcard shown above is aligned with standard 2OA02 taken from the Common Core Standards For Mathematics (see the extract below) as are the resources listed below.
Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.