
Eureka Math – 2nd – Lesson 10
More rectangle building – Let’s draw! In this lesson with Mr. Waldorf, students build on prior skills with concrete square tiles to draw rectangles composed of squares.

Eureka Math – 2nd – Lesson 11
Remove rows from an array – What happens when you remove rows or columns from an array? Join Mr. Waldorf for this lesson that encourages students to decompose rectangles and analyze the remaining rows or columns.

Eureka Math – 2nd – Lesson 12
Splitting up rectangles – Let’s make rectangles! Join Mr. Waldorf for this lesson as students explore different ways to make rectangles using the same number of squares each time. Students will need a pair of scissors.

Eureka Math – 2nd – Lesson 8
Build a rectangle with squares = Can you build a rectangle using squares? Join Mr. Waldorf for this lesson that encourages students to compose rectangles using square tiles with no gaps or overlaps and relate them to the array model.

Eureka Math – 2nd – Lesson 9
Build a rectangle with rows & columns – How can you use rows and columns to build a rectangle? Join Mr. Waldorf for this lesson that encourages students to relate rectangles composed of square tiles to the array model.

Eureka Math – 2nd – Lesson 7
Repeated addition word problems – Let’s use what we’ve learned to solve word problems! In this lesson, Mr. Waldorf and students will apply their understanding of equal rows and columns and repeated addition. Students will need a whiteboard and marker or pencil and paper.

Eureka Math – 2nd – Lesson 5
Array with equal groups. How can you make an array from a given number of objects? Join Mr. Waldorf for this lesson that encourages students to organize equal groups of objects into arrays either one row or one column at a time.

Eureka Math – 2nd – Lesson 6
Arrays with square tiles. How can we use square tiles to create arrays? Join Mr. Waldorf for this lesson as students compose arrays one row or one column at a time. Students will need up to 25 small square objects as well as a whiteboard and marker or pencil and paper.

Eureka Math – 2nd – Lesson 4
Count groups of a number. How can you use a tape diagram to represent equal groups? Join Mr. Waldorf to understand how numbers other than 1, 10, and 100 can be countable units.

Eureka Math – 2nd Grade – Lesson 1
Split counters into groups. Mr. Waldorf works on splitting counters into groups and shows different ways that numbers can be split into equal groups.