http://mrnussbaum.com/stockshelves/ uses negatives
http://www.mathplayground.com/locate_aliens.html uses negatives
http://hotmath.com/hotmath_help/games/ctf/ctf_hotmath.swf uses negatives
https://www.ixl.com/math/grade-5/graph-points-on-a-coordinate-plane a little less exciting but good practice
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