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How to add decimals and whole numbers
http://www.math.com/school/subject1/lessons/S1U1L1GL.html Lesson on adding decimals and whole numbers
How to add integers
How to subtract whole numbers and decimals
http://www.math.com/school/subject1/lessons/S1U1L4GL.html#sm2 Lesson on subtracting decimals.
How to subtract integers
How to multiply
http://www.math.com/school/subject1/lessons/S1U1L5GL.html Lesson on multiplying decimals.
How to multiply integers
How to divide
http://www.math.com/school/subject1/lessons/S1U1L6GL.html Lesson on dividing decimals.
How to divide integers
Order of operations
http://www.mathgoodies.com/lessons/vol7/order_operations.html This page has interactive examples of order of operations problems without exponents.
http://www.funbrain.com/algebra/index.html This is an order of operations game.
Place value
http://www.math.com/school/subject1/lessons/S1U1L1GL.html Lesson on place value
Number properties
http://www.purplemath.com/modules/numbprop.htm Basic number properties.
http://www.onlinemathlearning.com/number-properties.html More of the same
http://www.mathleague.com/help/wholenumbers/wholenumbers.htm This will link you to the index of most of the properties on the Quicky Quiz.
Scientific Notation
http://www.gomath.com/exercises/ScientificNotation.php How to convert a number from standard form to scientific notation and back again. It allows you to practice on the page.
Mean, Median, Mode, Range
http://www.purplemath.com/modules/meanmode.htm Defines and show you how to apply to a set of data.
Charts and Graphs
http://42explore.com/graphs.htm This is an index page from which you can navigate to all kinds of interesting sites on the topic.
Gaming Sites
http://www.funbrain.com/algebra/index.html
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