http://everydaymath.uchicago.edu/teaching-topics/computation/sub-counting-up/
http://sheppardsoftware.com/mathgames/earlymath/BPEnoughCoins.htm
 http://oakdome.com/k5/lesson-plans/second-grade-lesson-plans.php
 
http://www.abcya.com/second_grade_computers.htm
http://mathgames4children.com/fun-board-games/2nd-grade/crocs/place-value-crocodile-board-game-grade-1-game.html
http://www.free-training-tutorial.com/place-value/clickthedigit.html
http://www.sheppardsoftware.com/mathgames/placevalue/scooterQuestJunior.htm
https://www.internet4classrooms.com/online_practice/common_core/math_mathematics_1st_first_grade/quiz_determine_unknown_number_each_equation_1st_first_grade_math_mathematics_question_1.htm

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http://www.aplusmath.com/Flashcards/rounding.html?answer=&maxValue=1000
http://www.funbrain.com/verb/index.html?Grade=2