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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.

### 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.### Geometric Solids

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

This tool allows you to manipulate various geometric solids and investigate their properties.### Grouping and Grazing

Pre-K-2

Help the alien spaceship move cows into corrals by counting, adding, and
subtracting. This activity helps children learn grouping, tally marks,
and place value.### Okta's Rescue

Pre-K-2

Practice counting and subitizing by playing this game (also available on iOS and Android).

### Pan Balance – Expressions

3-5, 6-8, 9-12

Using this interactive tool, you can practice arithmetic and algebraic skills, and investigate the important concept of equivalence.### Pan Balance – Numbers

3-5, 6-8

Use this tool to strengthen understanding and computation of numerical expressions and equality using a balance scale.