Please try the websites when you are free.
Digital Manipulatives
http://nlvm.usu.edu/en/nav/frames_asid_264_g_2_t_1.html A good resource for addition & subtraction of decimal
http://www.eduplace.com/cgi-bin/schtemplate.cgi?template=/kids/mw/manip/mn_popup.thtml&filename=nmbl_int&title=Number%20Line&grade=4 - Using a number line
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