Deeanna Golden, a teacher of 24 years at F.M. Golson Elementary
School in Marianna, Florida, is a beloved Illuminations lesson plan
writer. So we asked her, "Why do you think it is important to share resources?"
In this unit, students use the area formula
for a rectangle to discover the area formulas for triangles,
parallelograms, and trapezoids. Students also consider irregular figures
whose areas can be determined by estimation or decomposition.
In this unit, students will use
geoboards to visualize the geometric meanings of square and square root.
Each geometric investigation in this
unit begins with an open-ended question that engages students in a study of
triangles and their properties. This lesson was adapted from "IDEAS"
by Marea W. Channel, which appeared in the November, 1993 Arithmetic Teacher
(Teaching Children Mathematics), Vol. 41, No. 3.
These investigations use movement to
reinforce the concepts of linear functions and systems of equations. Multiple
representations are used throughout, along with tools such as motion detectors
and remote-controlled cars. Students explore how position, speed, and varying
motion are reflected in graphs, tables, and algebraic equations.
In this interactive geometry investigation,
students explore polyhedra using different representations and
perspectives for three dimensional block figures. In addition, students
will examine area and volume concepts for block figures within this
If possible, each student should have access to an individual computer.
These activities guide students through a
rich exploration of percent concentration using both tactile
experiences and real-world applications. Students predict, model, and
generalize their conjectures about percent concentrations.
Count and subitize by playing a game.
This activity is available for your phone in the Android Market or Apple App Store.