Illuminations: Comparing Sets
Illuminations (National Council of Teachers of Mathematics)

A children’s book sets the stage for this lesson which encourages students to review counting back. In this lesson, children write subtraction problems and model them with cubes. They compare sets and record differences in the form of a table. The additive identity is reviewed in the context of comparing equal sets.

Illuminations: Exploring Adding with Sets
Illuminations (National Council of Teachers of Mathematics)

This lesson builds on the previous two lessons and encourages students to explore another model for addition, the set model.

Illuminations: Sorting Foods
Illuminations (National Council of Teachers of Mathematics)

Students sort foods using the categories of the Food Pyramid.

Illuminations: Pyramid Power
Illuminations (National Council of Teachers of Mathematics)

In this lesson, students make sets of a given number, explore relationships between numbers, and write numbers that name how many elements are in a group.

Illuminations: Zero Our Hero
Illuminations (National Council of Teachers of Mathematics)

Students explore sets of zero items and practice writing the numbers 0 through 5.

Illuminations: Here's a Handful
Illuminations (National Council of Teachers of Mathematics)

Students construct sets of up to five items, write the numeral 5, identify sets of five, and record “5” on a chart.

Illuminations: Finding Four
Illuminations (National Council of Teachers of Mathematics)

Students explore the number 4.

Illuminations: One, Two, Three--Go
Illuminations (National Council of Teachers of Mathematics)

After reviewing the numbers 2 and 3, students construct and identify sets of one. T

Illuminations: Three in a Set
Illuminations (National Council of Teachers of Mathematics)

In this lesson, students construct sets of three, compare them with sets of two, and write the numeral 3.

Illuminations: How Many Left?
Illuminations (National Council of Teachers of Mathematics)

This lesson encourages the students to explore the familiar set model of subtraction.

Illuminations: Recording Two Ways
Illuminations (National Council of Teachers of Mathematics)

The students make sets of pasta shapes and count some away, then record the subtraction in vertical and horizontal formats.