# Cybrary Grades K-2

A Cybrary, cyber-library, is a list of categories containing annotated links to webpages, research papers, and applications ordered by subject/content areas. The list is generated by many teachers and students working in the specific subject area.

Each link also has a discussion area behind it. When you add a link, please start the discussion area.

Cybrary (K-3) contains links to activities, links to research and links to teacher tools suitable for K-3 students.**Instructions for adding a link to a category:**

*Select*the**category**listed below. A new page appears.- In the General area,
*click***Turn editing on**(upper right). *Click***+Add an activity or resource**. A window with a list appears.*Scroll***to the bottom of the window**and*click***the radio button adjacent to URL**.*Click***Add**. A new window opens.*Enter***the page title**of the link you have selected.*Enter*a**description**of the link.*Select*the**check box**labeled .**Display description on project page.***Enter***the**External URL you have selected**.***Click*Appearance. The display area opens.*Un-check*the**box**adjacent to**Display URL description.***Open*the**display****drop-down menu**and*select***in Pop-up**.- At the bottom of the page,
*click***Save and return to project**.

.

Click Math above and view the video.

Some simple shapes can be put into broad categories. For instance, polygons are classified according to their number of edges as triangles, quadrilaterals,pentagons, etc. Each of these is divided into smaller categories; triangles can be equilateral, isosceles, obtuse, acute, scalene, etc. while quadrilaterals can berectangles, rhombi, trapezoids, squares, etc.

Other common shapes are points, lines, planes, and conic sections such as ellipses, circles, and parabolas.

Among the most common 3-dimensional shapes are polyhedra, which are shapes with flat faces; ellipsoids, which are egg-shaped or sphere-shaped objects;cylinders; and cones.

If an object falls into one of these categories exactly or even approximately, we can use it to describe the shape of the object. Thus, we say that the shape of amanhole cover is a disk, because it is approximately the same geometric object as an actual geometric disk.

The image is from wikipedia.org; https://en.wikipedia.org/wiki/File:Polygon_types.svg

- Manager: Mehri Fadavi

CCSS.MATH.CONTENT.3.NF.A.1

Understand a fraction 1/*b* as the quantity formed by 1 part when a whole is partitioned into *b* equal parts; understand a fraction *a*/*b* as the quantity formed by *a* parts of size 1/*b*.

CCSS.MATH.CONTENT.3.NF.A.2

Understand a fraction as a number on the number line; represent fractions on a number line diagram.

CCSS.MATH.CONTENT.3.NF.A.3

Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size.

http://mrnussbaum.com/third-grade-fractions/

Conceptual understanding of the place value system