ORC Resource Types

Discipline: Mathematics

Professional Commentary: Students classify buttons and make disjoint and overlapping Venn diagrams. They then reverse their reasoning by looking at objects that have been placed in Venn diagrams and determine the criteria that were used for sorting....

Discipline: Mathematics

Professional Commentary: This lesson focuses on two main ideas: the cardinality of sets with 10 or fewer elements and the identification of buttons by multiple attributes. Students make sets of buttons with the same number of buttons or one more or one less than a given number....

Discipline: Mathematics

Professional Commentary: Students use buttons to find simple sums, fill in a standard addition chart, and write addition sentences. They also explore the commutativity of addition....

Discipline: Mathematics

Professional Commentary: Students find all the ways 7 can be expressed as the sum of two numbers. They then write fact families of addition and subtraction sentences....

Discipline: Mathematics

Professional Commentary: Students model take-away subtraction with missing buttons on a shirt. They write subtraction sentences and begin to think of subtraction in terms of missing addends....

Discipline: Mathematics

Professional Commentary: Students use paper squares to see how many ways they can fold and then cut a square into two or four equal parts. They must demonstrate that the subdivisions thay obtain are congruent....

Discipline: Mathematics

Professional Commentary: Students use a 4-square quilt pattern to explore translations (slides) and reflections (flips). The site includes activity and recording sheets, discussion questions, extensions, suggestions for assessment, Internet resources, and reflection questions for the teacher....

Discipline: Mathematics

Professional Commentary: Students use a 4-square quilt pattern to explore rotations (turns). The site includes activity and recording sheets, discussion questions, extensions, suggestions for assessment, Internet resources, and reflection questions for the teacher....

Discipline: Mathematics

Professional Commentary: Students model comparison subtraction on the number line by counting the difference betweeen two positions either forward or backward. They relate the number line model to connecting cube trains....

Discipline: Mathematics

Professional Commentary: This lesson includes three different activities using a pan balance and connecting cubes to model subtraction. Students may also enjoy the pan balance applet linked to the site....