![Abacus icon](images1/icons/abacus_n.gif) |
Abacus – An electronic abacus that can be used to do arithmetic. |
![Bar Chart icon](images1/icons/barchart_n.gif) |
Bar Chart – Create a bar chart showing quantities or percentages by labeling columns and clicking on values. |
![Base Blocks icon](images1/icons/multbasebl_n.gif) |
Base Blocks – Illustrate addition and subtraction in a variety of bases. |
![Base Blocks Addition icon](images1/icons/baseblksadd_n.gif) |
Base Blocks Addition – Use base ten blocks to model grouping in addition. |
![Base Blocks Decimals icon](images1/icons/baseblksadd_n.gif) |
Base Blocks Decimals – Add and subtract decimal values using base blocks. |
![Base Blocks Subtraction icon](images1/icons/baseblksubtract_n.gif) |
Base Blocks Subtraction – Use base ten blocks to model separation of groups in subtraction. |
![Chip Abacus icon](images1/icons/chipabacus_n.gif) |
Chip Abacus – Learn about carrying and digits using chips. |
![Circle 0 icon](images1/icons/circle14_n.gif) |
Circle 0 – A puzzle involving adding positive and negative integers to sum to zero. |
![Circle 21 icon](images1/icons/circle14_n.gif) |
Circle 21 – A puzzle involving adding positive and negative integers to sum to twenty one. |
![Circle 3 icon](images1/icons/circle14_n.gif) |
Circle 3 – A puzzle involving adding positive real numbers to sum to three. |
![Circle 99 icon](images1/icons/circle14_n.gif) |
Circle 99 – A puzzle involving adding positive and negative integers to sum to ninety nine. |
![Color Chips - Addition icon](images1/icons/pluschips_n.gif) |
Color Chips - Addition – Use color chips to illustrate addition of integers. |
![Color Chips - Subtraction icon](images1/icons/pluschips_n.gif) |
Color Chips - Subtraction – Use color chips to illustrate subtraction of integers. |
![Color Patterns icon](images1/icons/seqofcolor_n.gif) |
Color Patterns – Arrange colors to complete a pattern. |
![Diffy icon](images1/icons/diffy_n.gif) |
Diffy – Solve an interesting puzzle involving the differences of given numbers. |
![Factor Tree icon](images1/icons/factortree_n.gif) |
Factor Tree – Factor numbers using a tree diagram. |
![Fraction Bars icon](images1/icons/fractionbars_n.gif) |
Fraction Bars – Learn about fractions using fraction bars. |
![Fraction Pieces icon](images1/icons/fractionpieces_n.gif) |
Fraction Pieces – Work with parts and wholes to learn about fractions. |
![Fractions - Adding icon](images1/icons/addingfract_n.gif) |
Fractions - Adding – Illustrates what it means to find a common denominator and combine. |
![Fractions - Comparing icon](images1/icons/comparfract_n.gif) |
Fractions - Comparing – Judge the size of fractions and plot them on a number line. |
![Fractions - Equivalent icon](images1/icons/equivfract_n.gif) |
Fractions - Equivalent – Illustrates relationships between equivalent fractions. |
![Fractions - Naming icon](images1/icons/namefract_n.gif) |
Fractions - Naming – Write the fraction corresponding to the highlighted portion of a shape. |
![Fractions - Parts of a Whole icon](images1/icons/partswhole_n.gif) |
Fractions - Parts of a Whole – Relates parts of a whole unit to written description and fraction. |
![Fractions - Rectangle Multiplication icon](images1/icons/rmfractions_n.gif) |
Fractions - Rectangle Multiplication – Visualize and practice multiplying fractions using an area representation. |
![Fractions - Visualizing icon](images1/icons/visfract_n.gif) |
Fractions - Visualizing – Illustrate a fraction by dividing a shape and highlighting the appropriate parts. |
![Grapher icon](images1/icons/2dgrapher_n.gif) |
Grapher – A tool for graphing and exploring functions. |
![Hundreds Chart icon](images1/icons/counting_n.gif) |
Hundreds Chart – Practice counting and visualize number patterns using a hundreds chart. |
![Mastermind icon](images1/icons/mastermind_n.gif) |
Mastermind – Use inference and logic to play a game and guess a hidden pattern of pegs. |
![Money icon](images1/icons/money_n.gif) |
Money – Learn about money by counting and making change. |
![Number Line Arithmetic icon](images1/icons/numlinearith_n.gif) |
Number Line Arithmetic – Illustrates arithmetic operations using a number line. |
![Number Line Bars icon](images1/icons/numberlinebars_n.gif) |
Number Line Bars – Use bars to show addition, subtraction, multiplication, and division on a number line. |
![Number Line Bars - Fractions icon](images1/icons/nlfractionbars_n.gif) |
Number Line Bars - Fractions – Divide fractions using number line bars. |
![Number Line Bounce icon](images1/icons/numlinebounce_n.gif) |
Number Line Bounce – Number line addition and subtraction game. |
![Number Patterns icon](images1/icons/seqofnum_n.gif) |
Number Patterns – Discover the pattern and complete a sequence of numbers. |
![Number Puzzles icon](images1/icons/numberpuzz_n.gif) |
Number Puzzles – Solve puzzles involving arranging numbers on a diagram so that they add up to a given value. |
![Peg Puzzle icon](images1/icons/pegpuzzle_n.gif) |
Peg Puzzle – Win this game by moving the pegs on the left past the pegs on the right. |
![Percent Grids icon](images1/icons/percentgrids_n.gif) |
Percent Grids – Represent, name, and explore percentages using hundreds grids. |
![Percentages icon](images1/icons/percentages_n.gif) |
Percentages – Discover relationships between fractions, percents, and decimals. |
![Pie Chart icon](images1/icons/piechart_n.gif) |
Pie Chart – Explore percentages and fractions using pie charts. |
![Place Value Number Line icon](images1/icons/placevaluenumline_n.gif) |
Place Value Number Line – Explore place value by placing dots on number lines. |
![Rectangle Division icon](images1/icons/rdivision_n.gif) |
Rectangle Division – Visualize and practice dividing numbers by using an area representation. |
![Rectangle Multiplication icon](images1/icons/rmultiplication_n.gif) |
Rectangle Multiplication – Visualize the multiplication of two numbers as an area. |
![Rectangle Multiplication of Integers icon](images1/icons/rmultiplication_n.gif) |
Rectangle Multiplication of Integers – Visualize and practice multiplying integers using an area representation. |
![Sieve of Eratosthenes icon](images1/icons/sieveeratos_n.gif) |
Sieve of Eratosthenes – Relate number patterns with visual patterns. |
![Tangrams icon](images1/icons/tangrams_n.gif) |
Tangrams – Use all seven Chinese puzzle pieces to make shapes and solve problems. |
![Venn Diagrams icon](images1/icons/venndiag_n.gif) |
Venn Diagrams – Investigate common features of sets. |
![Abacus icon](images1/icons/abacus_n.gif) |
Abacus – An electronic abacus that can be used to do arithmetic. |
![Base Blocks icon](images1/icons/multbasebl_n.gif) |
Base Blocks – Illustrate addition and subtraction in a variety of bases. |
![Base Blocks Addition icon](images1/icons/baseblksadd_n.gif) |
Base Blocks Addition – Use base ten blocks to model grouping in addition. |
![Base Blocks Decimals icon](images1/icons/baseblksadd_n.gif) |
Base Blocks Decimals – Add and subtract decimal values using base blocks. |
![Base Blocks Subtraction icon](images1/icons/baseblksubtract_n.gif) |
Base Blocks Subtraction – Use base ten blocks to model separation of groups in subtraction. |
![Chip Abacus icon](images1/icons/chipabacus_n.gif) |
Chip Abacus – Learn about carrying and digits using chips. |
![Circle 0 icon](images1/icons/circle14_n.gif) |
Circle 0 – A puzzle involving adding positive and negative integers to sum to zero. |
![Circle 21 icon](images1/icons/circle14_n.gif) |
Circle 21 – A puzzle involving adding positive and negative integers to sum to twenty one. |
![Circle 3 icon](images1/icons/circle14_n.gif) |
Circle 3 – A puzzle involving adding positive real numbers to sum to three. |
![Circle 99 icon](images1/icons/circle14_n.gif) |
Circle 99 – A puzzle involving adding positive and negative integers to sum to ninety nine. |
![Color Chips - Subtraction icon](images1/icons/pluschips_n.gif) |
Color Chips - Subtraction – Use color chips to illustrate subtraction of integers. |
![Conway's Game of Life icon](images1/icons/conwaygamelife_n.gif) |
Conway's Game of Life – Discover the rules that determine change in these simulations. |
![Diffy icon](images1/icons/diffy_n.gif) |
Diffy – Solve an interesting puzzle involving the differences of given numbers. |
![Dueling Calculators icon](images1/icons/duelingcalc_n.gif) |
Dueling Calculators – Visualize a dramatic simulation of the effect of propagating rounding errors. |
![Factor Tree icon](images1/icons/factortree_n.gif) |
Factor Tree – Factor numbers using a tree diagram. |
![Fibonacci Sequence icon](images1/icons/fibonacci_n.gif) |
Fibonacci Sequence – Explore the Fibonacci sequence and the golden ratio. |
![Fraction Pieces icon](images1/icons/fractionpieces_n.gif) |
Fraction Pieces – Work with parts and wholes to learn about fractions. |
![Fractions - Adding icon](images1/icons/addingfract_n.gif) |
Fractions - Adding – Illustrates what it means to find a common denominator and combine. |
![Fractions - Comparing icon](images1/icons/comparfract_n.gif) |
Fractions - Comparing – Judge the size of fractions and plot them on a number line. |
![Fractions - Equivalent icon](images1/icons/equivfract_n.gif) |
Fractions - Equivalent – Illustrates relationships between equivalent fractions. |
![Fractions - Rectangle Multiplication icon](images1/icons/rmfractions_n.gif) |
Fractions - Rectangle Multiplication – Visualize and practice multiplying fractions using an area representation. |
![Function Machine icon](images1/icons/fnmachine_n.gif) |
Function Machine – Explore the concept of functions by putting values into this machine and observing its output. |
![Golden Rectangle icon](images1/icons/goldenrectangle_n.gif) |
Golden Rectangle – Illustrates iterations of the Golden Section. |
![Grapher icon](images1/icons/2dgrapher_n.gif) |
Grapher – A tool for graphing and exploring functions. |
![Mastermind icon](images1/icons/mastermind_n.gif) |
Mastermind – Use inference and logic to play a game and guess a hidden pattern of pegs. |
![Money icon](images1/icons/money_n.gif) |
Money – Learn about money by counting and making change. |
![Number Line Bars - Fractions icon](images1/icons/nlfractionbars_n.gif) |
Number Line Bars - Fractions – Divide fractions using number line bars. |
![Number Line Bounce icon](images1/icons/numlinebounce_n.gif) |
Number Line Bounce – Number line addition and subtraction game. |
![Number Puzzles icon](images1/icons/numberpuzz_n.gif) |
Number Puzzles – Solve puzzles involving arranging numbers on a diagram so that they add up to a given value. |
![Pascal's Triangle icon](images1/icons/pascalstri_n.gif) |
Pascal's Triangle – Explore patterns created by selecting elements of Pascal's triangle. |
![Peg Puzzle icon](images1/icons/pegpuzzle_n.gif) |
Peg Puzzle – Win this game by moving the pegs on the left past the pegs on the right. |
![Percent Grids icon](images1/icons/percentgrids_n.gif) |
Percent Grids – Represent, name, and explore percentages using hundreds grids. |
![Percentages icon](images1/icons/percentages_n.gif) |
Percentages – Discover relationships between fractions, percents, and decimals. |
![Sieve of Eratosthenes icon](images1/icons/sieveeratos_n.gif) |
Sieve of Eratosthenes – Relate number patterns with visual patterns. |
![Spinners icon](images1/icons/spinner_n.gif) |
Spinners – Work with spinners to learn about numbers and probabilities. |
![Tangrams icon](images1/icons/tangrams_n.gif) |
Tangrams – Use all seven Chinese puzzle pieces to make shapes and solve problems. |
![Tight Weave icon](images1/icons/tightweave_n.gif) |
Tight Weave – Visualize the creation of the Sierpinski Carpet, an iterative geometric pattern that resembles a woven mat. |
![Turtle Geometry icon](images1/icons/turtlegeometry_n.gif) |
Turtle Geometry – Explore numbers, shapes, and logic by programming a turtle to move. |
![Venn Diagrams icon](images1/icons/venndiag_n.gif) |
Venn Diagrams – Investigate common features of sets. |
![Abacus icon](images1/icons/abacus_n.gif) |
Abacus – An electronic abacus that can be used to do arithmetic. |
![Circle 0 icon](images1/icons/circle14_n.gif) |
Circle 0 – A puzzle involving adding positive and negative integers to sum to zero. |
![Circle 21 icon](images1/icons/circle14_n.gif) |
Circle 21 – A puzzle involving adding positive and negative integers to sum to twenty one. |
![Circle 3 icon](images1/icons/circle14_n.gif) |
Circle 3 – A puzzle involving adding positive real numbers to sum to three. |
![Circle 99 icon](images1/icons/circle14_n.gif) |
Circle 99 – A puzzle involving adding positive and negative integers to sum to ninety nine. |
![Conway's Game of Life icon](images1/icons/conwaygamelife_n.gif) |
Conway's Game of Life – Discover the rules that determine change in these simulations. |
![Counting All Pairs icon](images1/icons/allpairs_n.gif) |
Counting All Pairs – Create a path that sets up a one-to-one correspondence between the counting numbers and infinite sets of ordered pairs of integers. |
![Diffy icon](images1/icons/diffy_n.gif) |
Diffy – Solve an interesting puzzle involving the differences of given numbers. |
![Dueling Calculators icon](images1/icons/duelingcalc_n.gif) |
Dueling Calculators – Visualize a dramatic simulation of the effect of propagating rounding errors. |
![Fibonacci Sequence icon](images1/icons/fibonacci_n.gif) |
Fibonacci Sequence – Explore the Fibonacci sequence and the golden ratio. |
![Fractions - Adding icon](images1/icons/addingfract_n.gif) |
Fractions - Adding – Illustrates what it means to find a common denominator and combine. |
![Fractions - Equivalent icon](images1/icons/equivfract_n.gif) |
Fractions - Equivalent – Illustrates relationships between equivalent fractions. |
![Function Machine icon](images1/icons/fnmachine_n.gif) |
Function Machine – Explore the concept of functions by putting values into this machine and observing its output. |
![Golden Rectangle icon](images1/icons/goldenrectangle_n.gif) |
Golden Rectangle – Illustrates iterations of the Golden Section. |
![Grapher icon](images1/icons/2dgrapher_n.gif) |
Grapher – A tool for graphing and exploring functions. |
![Mastermind icon](images1/icons/mastermind_n.gif) |
Mastermind – Use inference and logic to play a game and guess a hidden pattern of pegs. |
![Number Puzzles icon](images1/icons/numberpuzz_n.gif) |
Number Puzzles – Solve puzzles involving arranging numbers on a diagram so that they add up to a given value. |
![Pascal's Triangle icon](images1/icons/pascalstri_n.gif) |
Pascal's Triangle – Explore patterns created by selecting elements of Pascal's triangle. |
![Peg Puzzle icon](images1/icons/pegpuzzle_n.gif) |
Peg Puzzle – Win this game by moving the pegs on the left past the pegs on the right. |
![Percentages icon](images1/icons/percentages_n.gif) |
Percentages – Discover relationships between fractions, percents, and decimals. |
![Rational Numbers Triangle icon](images1/icons/rationaltriangle_n.gif) |
Rational Numbers Triangle – Explore a triangular array that contains every positive rational number exactly once. |
![Sieve of Eratosthenes icon](images1/icons/sieveeratos_n.gif) |
Sieve of Eratosthenes – Relate number patterns with visual patterns. |
![Tight Weave icon](images1/icons/tightweave_n.gif) |
Tight Weave – Visualize the creation of the Sierpinski Carpet, an iterative geometric pattern that resembles a woven mat. |
![Turtle Geometry icon](images1/icons/turtlegeometry_n.gif) |
Turtle Geometry – Explore numbers, shapes, and logic by programming a turtle to move. |
![Venn Diagrams icon](images1/icons/venndiag_n.gif) |
Venn Diagrams – Investigate common features of sets. |