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### 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.### 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).### 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.

### 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

3-5, 6-8

Dividing Numbers into Two Factors and Building Arrays to Represent Each Factorization### 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.### Free Ride

6-8, 9-12

Explore fractions using the context of a bicycle and gear ratios.### Primary Krypto

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

Combine five
number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a
"target" number.### Electronic Abacus

Pre-K-2, 3-5

This applet explores the use of an abacus model for representing numbers and for performing addition.