A childrenâ€™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.

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

Students sort foods using the categories of the Food Pyramid.

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.

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

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

Students explore the number 4.

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

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

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

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