This activity addresses CCSS 2.OA.C.4 where students count dots in an array using repeated addition. This skill lays the foundation for an understanding of multiplication.

Create arrays by adding and subtracting rows and columns. The related multiplication facts are displayed in two formats: rows x columns and columns x rows.

The definition of an array data structure with links to array subtopics.

A review of tutorials on arrays.

Third graders decompose an irregular polygon into arrays to find the area.

Third graders develop a meaning of multiplication through the use of arrays.

A teaching guide for the Intro to JS lesson on Arrays.

Animation showing the mechanics of a DNA array, a recently discovered method to analyze patterns of gene expression at different timepoints in a living cell.

A number story activity for students to practice addition of equal groups and multiplication.

This video illustrates a word problem involving the multiplication of fractions using an array to model the solution visually. The problem involves puffins, arctic birds that live in colonies and fish to feed their young.

This video illustrates how to use an array as a visual model for solving a word problem involving the division of fractions and mixed numbers. The problem asks students to determine the width of a rectangular fennec fox den based on its...

This video illustrates a visual model for solving a word problem involving the division of fractions. The problem asks students to determine the width of a rectangular platypus burrow based on its length and area. In the accompanying...

This task aims to show students that there is often more than one way to represent a quantity. This lesson also lays a foundation for students to understand the commutative property of multiplication.

A list of suggested activities for addressing CCSS 2.OA.C.4 where students work with arrays and repeated addition. Includes a problem for a 3X5 array and its solution in a video. [8:23]

A Wikipedia description of the array data structure.

[Free Registration/Login Required] Students are presented with a rectangular area model and asked to write an equation that represents the distributive property. Detailed lesson plan provided, along with assessment methods,...

This advanced site discusses some of the research done and research techniques used in studies of the Monterey Canyon. Great graphics showing the position of the canyon relative to other features of the continental margin. Also...

Wikipedia offers a basic description of what the Very Large Array (VLA) is, along with a close-up picture of the VLA.

A Wikipedia description of the abstract data type known by several names, including map, dictionary, associative array, lookup table, and others.

Create multiplication fact arrays using this tool. Click a number on the side and then the times symbol. Now click a number along the top and the equals symbol. The array appears in yellow. The answer in digits is shown at the bottom of...

Practice representing multiplication as equal groups, repeated addition, or arrays. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints. Video content is available for...

This resource investigates the concept of factors by creating rectangular arrays. The interactive tool allows learners to relate area to multiplication.

Students will take a virtual tour of a Peep Candy factory. Students will observe the way Peeps are packed in rectangle shaped arrays, 2 rows of 5.

Third graders work with decomposing arrays in order to practice finding small areas and putting the totals together. In this third instructional activity, they will work on finding smaller areas that make mental math more feasible.