http://www.ixl.com/math/grade-2/ways-to-make-a-number-using-subtraction
http://www.ixl.com/math/grade-2/balance-subtraction-equations-up-to-two-digits
http://www.ixl.com/math/grade-2/which-sign-plus-or-minus-makes-the-number-sentence-true
http://www.ixl.com/math/grade-2/add-and-subtract-numbers-up-to-100
http://www.mathgametime.com/games/alien-addition
http://www.mathgametime.com/games/subtraction-game-minus-mission
distractie
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