What is a number line? How can you use one to compare large and small numbers? Find the answers to these questions, play with an interactive number line, and follow links to information on adding, subtracting, and understanding absolute value using a number line.
Resize and rotate different types of quadrilaterals--square, rectangle, rhombus, trapezoid, and kite--while learning the definitions of these different shapes and labeling the angles and diagonals. CCSS.Math.Content.3.G.A.1 Understand that shapes in different categories
A definition of skip counting followed by interactive examples and links to exercises that will help your skip-counting skills. Learn to skip count by 2, by 3, by 4, by 5, and by 10, and challenge yourself with backwards skip counting.