National Library of Virtual Manipulatives (NLVM)
http://nlvm.usu.edu/en/nav/vlibrary.html
Very nice source of manipulatives arranged by topic and grade level from Utah State University.
Ohio Treasure Chest
http://ohiotreasurechest.org/
Collection of web resources tied to the state mathematics standards. Organized by grade and run by the North Canton City Schools. Click Math (they have other subject areas too)
Shodor
http://www.shodor.org/interactivate/activities/
Sortable list of nice demonstations. Sortable by Topic or Grade.
Cut The Knot
http://www.cut-the-knot.org/
Large site with many interesting facts and activities about many areas of math (all levels).
Math Playground Activities
http://www.mathplayground.com/index.html
Variety of Math Activities and Games for class. See also their Math Manipulatives Page.
Addition by Blocks
From NLVM.org
Subtraction by Blocks
From NLVM.org
Color Chips - Addition
From NLVM.org
Color Chips - Subtraction
From NLVM.org
Number Line Bounce - addition and subtraction of pos/neg integers
From NLVM.org
Addition by Base Blocks
From NLVM.org
Subtraction by Base Blocks
From NLVM.org
Zomming in on a number line
Zoomable number line
Pretty cool zommable nuumber line. Explore the meaning of the place values of 1/10's, 1/100's and 1/000's. Gives a visual of how the tick-marks show the place value.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam gravida lorem vel felis aliquet placerat. Donec auctor, arcu vel suscipit placerat, mauris enim tempus neque, non posuere nibh sem vitae metus. Aenean rutrum, diam vel dapibus eleifend, quam nibh congue purus, at sagittis odio mi eget quam. Vestibulum bibendum magna eu purus facilisis ornare. Donec felis nisl, eleifend sed bibendum et, molestie at purus. Cras viverra semper magna id mollis. Suspendisse dui urna, suscipit eu ullamcorper quis, rutrum nec urna. Integer ullamcorper congue justo, vestibulum consequat arcu tincidunt sed. Vivamus at sem lectus.
Equivalent Fractions
NLVM -Equivalent Fractions
Visualize equivalent fractions. Also, place them on the number line and find fractions between the two given. How many methods can you think of to produce an "in-between" fraction everytime?
Common Denominators for two Fractions
NLVM - Find Common Denominators
Visualize common denominators by making the parts of both whole the same size.
Illuminations with Fractions
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Compare fractions, decimals, percents. Slide the Numerator and Denominators near the bottom for nice visualization of fractions and percents.
Thinking Blocks to Model Word Problems
Thinking Blocks
Use "Thinking Blocks" to model various word problems involving fractions.
Fraction Slider Game Helps compare and add fractions
Fraction Slider Game