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### 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.

### 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.### Factor Game

3-5, 6-8

Exercise your factoring ability against a human or the computer in this Calculation Nation game.### Fraction Game

3-5, 6-8

This applet allows students to individually practice working with relationships among fractions and ways of combining fractions.### KenKen

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

Developing Calculation Skills, Logical Thinking and Persistence with a Puzzle Game### Tower of Hanoi

6-8, 9-12

Use this applet to solve the Towers of Hanoi puzzle: move all the discs from the first peg to the last.