Second graders arrange objects into arrays — equal rows and columns — and discover repeated addition, the powerful shortcut that gets them ready for multiplication.
Students will be able to…
An egg carton has 2 rows of 6 eggs. Instead of counting all 12 one by one, is there a faster way to know how many?
Project this and change the rows and columns. Watch the dots make an array — then add the rows to find the total!
Tap any phase to open the teacher moves and student actions.
2 rows of 6 eggs — how many, without counting each one?
Teacher models.
Class uses Build an Array.
Students make arrays.
One array.
Aligned to the Common Core State Standards for Mathematics.
Use addition to find the total number of objects in rectangular arrays.
Partition a rectangle into rows and columns of same-size squares.
Write an equation to express an even number as a sum of two equal addends.
Look for repeated reasoning (repeated addition).
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students write a multiplication sentence for each array they build (like 3 rows of 4 = 3 × 4 = 12). A printable array sheet is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.