These four operations are the foundation for Algebra. Any student who cannot solve them correctly 95-100% of the time will struggle with any other Algebra content as these operations are embedded in every single Algebra problem. If you need it please spend a lot of time in this section.
Addition
http://www.khanacademy.org/math/arithmetic/absolute-value/adding_subtracting_negatives/v/adding-integers-with-different-signs
Addition and Subtraction examples
http://www.khanacademy.org/math/arithmetic/absolute-value/adding_subtracting_negatives/v/adding-and-subtracting-negative-number-examples
Addition/Subtraction practice
http://www.khanacademy.org/math/arithmetic/absolute-value/adding_subtracting_negatives/e/adding_and_subtracting_negative_numbers
http://nlvm.usu.edu/en/nav/frames_asid_161_g_2_t_1.html (Addition)
http://nlvm.usu.edu/en/nav/frames_asid_162_g_2_t_1.html (Subtraction)
Multiplication
http://www.khanacademy.org/math/arithmetic/absolute-value/mult_div_negatives/v/multiplying-positive-and-negative-numbers
Division
http://www.khanacademy.org/math/arithmetic/absolute-value/mult_div_negatives/v/dividing-positive-and-negative-numbers
Multiplication and Division Practice
http://www.khanacademy.org/math/arithmetic/absolute-value/mult_div_negatives/e/multiplying_and_dividing_negative_numbers
Jeopardy game practicing all operations
http://www.math-play.com/Integers-Jeopardy/Integers-Jeopardy.html
Integer Explanation Article
http://math.about.com/od/prealgebra/ht/PostiveNeg.htm
More Practice
http://teacherpages.hallco.org/webpages/rboulter/seventhgrademath.cfm?subpage=885237
http://www.ixl.com/math/grade-6
IXL offers many practice problems for:
Addition and subtraction of integers scroll down to section I.4 through I.10
Multiplication scroll down to sections k.11 and k.12
Division scroll down to L.7 and L.8
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