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### Three in a Set

Pre-K-2

In this lesson, students construct sets of three, compare them with sets of two, and write the numeral 3. They also show a set of three on their recording chart. ### One, Two, Three--Go

Pre-K-2

After reviewing the numbers 2 and 3, students construct and identify sets of one. They compare sets of one, two, and three objects and record a set of three in chart form. ### Finding Four

Pre-K-2

Students explore the number 4. They make sets of four, write the numeral 4, and compare sets of four to sets of one, two, and three.### Zero Our Hero

Pre-K-2

Students explore sets of zero items and practice writing the numbers 0 through 5. Students count back from five, identify sets of up to five items, and record "0" on a chart. They also construct sets of up to five items. ### Finding Addition Patterns

Pre-K-2

A game encourages students to find the sums of two one-digit numbers. Students explore commutativity and examine patterns on an addition table. They then use a personal addition chart to record and keep track of known facts. ### Finding Sums to Six

Pre-K-2

In this lesson, students discover the role of the additive identity and explore sums to six. They continue to complete their personal addition charts. ### Some Special Sums

Pre-K-2

Students practice doubles and doubles-plus-one addition facts. They record their current level of mastery of the addition facts on their personal addition charts. ### Addend Pairs to 12

Pre-K-2

Students practice their addition facts for sums up to 12 by playing a game. They add to their personal addition charts. Students are encouraged to practice the facts that they have not yet mastered. Finally, triangular flash cards help students practice addition facts.### Wrapping up the Unit

Pre-K-2

In this final lesson of the unit, students display their knowledge of properties of objects for sorting and creating patterns. They also demonstrate an understanding of commutativity and model addition and subtraction of whole numbers using different representations.### Counting Back and Counting On

Pre-K-2

This lesson, which focuses on the counting model for subtraction, begins with reading a counting book. The students model the numbers as the book is read. Then they make a chain of links and write in vertical and horizontal format the differences suggested by adding and subtracting one link at a time from their chains. Finally, they draw a chain showing one link being taken away and write in two formats the difference it represents.