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Abacus
– An electronic abacus that can be used to do arithmetic. |
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Base
Blocks – Illustrate addition and subtraction in a variety of
bases. |
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Base
Blocks Addition – Use base ten blocks to model grouping in
addition. |
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Base
Blocks Decimals – Add and subtract decimal values using base
blocks. |
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Base
Blocks Subtraction – Use base ten blocks to model separation of
groups in subtraction. |
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Chip
Abacus – Learn about carrying and digits using chips. |
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Circle
0 – A puzzle involving adding positive and negative integers to
sum to zero. |
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Circle
21 – A puzzle involving adding positive and negative integers to
sum to twenty one. |
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Circle
3 – A puzzle involving adding positive real numbers to sum to
three. |
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Circle
99 – A puzzle involving adding positive and negative integers to
sum to ninety nine. |
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Color
Chips - Subtraction – Use color chips to illustrate subtraction of
integers. |
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Conway's
Game of Life – Discover the rules that determine change in these
simulations. |
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Diffy
– Solve an interesting puzzle involving the differences of given
numbers. |
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Dueling
Calculators – Visualize a dramatic simulation of the effect of
propagating rounding errors. |
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Factor
Tree – Factor numbers using a tree diagram. |
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Fibonacci
Sequence – Explore the Fibonacci sequence and the golden ratio. |
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Fraction
Pieces – Work with parts and wholes to learn about fractions. |
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Fractions
- Adding – Illustrates what it means to find a common denominator
and combine. |
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Fractions
- Comparing – Judge the size of fractions and plot them on a
number line. |
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Fractions
- Equivalent – Illustrates relationships between equivalent
fractions. |
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Fractions
- Rectangle Multiplication – Visualize and practice multiplying
fractions using an area representation. |
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Function
Machine – Explore the concept of functions by putting values into
this machine and observing its output. |
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Golden
Rectangle – Illustrates iterations of the Golden Section. |
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Grapher
– A tool for graphing and exploring functions. |
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Mastermind
– Use inference and logic to play a game and guess a hidden pattern of
pegs. |
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Money
– Learn about money by counting and making change. |
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Number
Line Bars - Fractions – Divide fractions using number line bars. |
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Number
Line Bounce – Number line addition and subtraction game. |
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Number
Puzzles – Solve puzzles involving arranging numbers on a diagram
so that they add up to a given value. |
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Pascal's
Triangle – Explore patterns created by selecting elements of
Pascal's triangle. |
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Peg
Puzzle – Win this game by moving the pegs on the left past the
pegs on the right. |
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Percentages
– Discover relationships between fractions, percents, and decimals. |
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Sieve
of Eratosthenes – Relate number patterns with visual patterns. |
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Spinners
– Work with spinners to learn about numbers and probabilities. |
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Tangrams
– Use all seven Chinese puzzle pieces to make shapes and solve
problems. |
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Tight
Weave – Visualize the creation of the Sierpinski Carpet, an
iterative geometric pattern that resembles a woven mat. |
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Turtle
Geometry – Explore numbers, shapes, and logic by programming a
turtle to move. |
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