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### Ten Frame

Pre-K-2

The four games that can be played with this applet help to develop counting and addition skills.### How Many Under the Shell?

Pre-K-2

Use this tool to practice addition and subtraction with Okta, the octopus.### Primary Krypto

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

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

Pre-K-2, 3-5

Use this tool to design a pattern using geometric shapes.### Shape Tool

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

This tool allows you to create any geometric shape
imaginable. Squares, triangles, rhombi, trapezoids and hexagons can be created,
colored, enlarged, shrunk, rotated, reflected, sliced, and glued together.### Electronic Abacus

Pre-K-2, 3-5

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

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

Developing Calculation Skills, Logical Thinking and Persistence with a Puzzle Game### Times Table

Pre-K-2, 3-5

This tool allows you to practice multiplying single-digit numbers.### Shape Cutter

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

With this tool, you can explore how to decompose shapes and recompose
them to make other shapes. You can draw and cut shapes and also use
slides, turns, and flips to move pieces around.### 4.1.2 Describing Patterns

Pre-K-2

Give examples of various ways students might interpret the same sequence of cubes.