Fifth Grade Mathematics
Unit 1
Geometry
Printable Parent Letter
During Unit 1, students learn to analyze and relate categories of twodimensional shapes explicitly based on their properties. Based on analysis of properties, they classify twodimensional figures in hierarchies. For example, they conclude that all rectangles are parallelograms, because they are all quadrilaterals with two pairs of opposite, parallel, equallength sides. In this way, they relate certain categories of shapes as subclasses of other categories.

Students need to:
 Use a pair of perpendicular number lines, called axes, to define a coordinate system, with the intersection of the lines (the origin) arranged to coincide with the 0 on each line and a given point in the plane located by using an ordered pair of numbers, called its coordinates. Understand that the first number indicates how far to travel from the origin in the direction of one axis, and the second number indicates how far to travel in the direction of the second axis, with the convention that the names of the two axes and the coordinates correspond (e.g., xaxis and xcoordinate, yaxis and ycoordinate).
 Represent real world and mathematical problems by graphing points in the first quadrant of the coordinate plane, and interpret coordinate values of points in the context of the situation.
 Understand that attributes belonging to a category of twodimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.
 Classify twodimensional figures in a hierarchy based on properties.

Carroll County Public Schools Video Support 
Ways Parents Can Help
 Help your child solve realworld problems by creating and analyzing a graph. For example, Sara has saved $20. She earns $8 for each hour she works. If Sara saves all of her money, how much will she have after working 3 hours? 5 hours? 10 hours?
 Create a graph that shows the relationship between the hours Sara worked and the amount of money she has saved. What other information do you know from analyzing the graph?

Some Support Sites
Math Open Reference  coordinate planes
Geometry Terms

Key Vocabulary to Know 
Coordinate System
Coordinate Plane
First Quadrant
Points
Lines
Axis/Axes
xaxis
yaxis

Horizontal
Vertical
Intersection of lines
Origin
Ordered Pairs
Coodrdinates
xcoordinate
ycoordinate
