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CoinBox
Number and Operations

Coin Box

Pre-K-2, 3-5
Learn how to count, collect, exchange, and make change for coins by manipulating coins using an array representation.
DeepSeaDuel ICON
Algebra

Deep Sea Duel

3-5, 6-8
This strategy game requires you to select cards with a specified sum before your opponent (also available on iOS and Android).
DynamicPaper ICON
Data Analysis and Probability

Dynamic Paper

Pre-K-2, 3-5, 6-8, 9-12

Need a pentagonal pyramid that's six inches tall? Or a number line that goes from ‑18 to 32 by 5's? You can create all those things and more! Place the images you want, then export it as a PDF or as a JPG image.

EquivalentFractions
Number and Operations

Equivalent Fractions

3-5

This applet allows you to create equivalent fractions by dividing and shading squares or circles, and match each fraction to its location on the number line.

Factorize
Number and Operations

Factorize

3-5, 6-8
Dividing Numbers into Two Factors and Building Arrays to Represent Each Factorization
FractionModels
Number and Operations

Fraction Models

3-5, 6-8
Explore different representations for fractions including improper fractions, mixed numbers, decimals, and percentages. Additionally, there are length, area, region, and set models.
FreeRide
Number and Operations

Free Ride

6-8, 9-12
Explore fractions using the context of a bicycle and gear ratios.
Concentration
Geometry

Concentration

Pre-K-2, 3-5

Play a matching game with different representations of equivalent items.

PrimaryKrypto
Number and Operations

Primary Krypto

Pre-K-2, 3-5, 6-8
Combine five number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a "target" number.
ElectronicAbacus
Number and Operations

Electronic Abacus

Pre-K-2, 3-5
This applet explores the use of an abacus model for representing numbers and for performing addition.