In this Seaside Symmetry Activity, students recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts.

Using this Area and Perimeter Pirate Activity, students apply the area and perimeter formulas for rectangles to match each pirate with his ship.

Using this They're Equal Equivalent Fractions Activity, students explain equivalence of fractions and compare fractions by reasoning about their size.

In this 4.MD.5 Common Core Activity, students recognize angles as obtuse, acute or right by playing this game of War with a partner!

In this Up, Up, and Away! Measuring Angles Activity, students solve addition and subtraction problems to find unknown angles on a diagram.

Using this Equivalent Fractions 10 100 Denominators Activity, students express a fraction with a denominator 10 as an equivalent fraction with a denominator of 100.

Using this Baking with Geometry Activity, students match picture cards to the appropriate geometry term, identifying points, lines, line segments, rays, and angles.

Using this Design Your Own Theme Park Unit Square Activity, students measure areas by counting unit squares.

Using this Geometric Measurement Understanding Unit Squares Activity, match area terms and definitions in order to be able to find area.

Using this Make it Equal Partitioning Shapes Activity, students cut shapes into small parts and then describe them as halves, fourths, or quarters.

Using this Battle Shape Battleship Activity, students classify two-dimensional figures by their properties by playing a game of Battle Shape (a geometrical rendition of Battleship).

Using this Number Line Fractions Activity, students understand a fraction as a number on the number line and represent fractions on a number line diagram.

Using Finding the Perimeter Activity, students find the perimeter of a polygon when there is an unknown side length.

Using this Geometric Measurement Area Activity, students measure areas by counting unit square and matching square units to pictures.

Using this Sort It Organizing Shapes Activity, students sort pictures of 2D shapes into the category that have the same shape attributes.

Using this Geometric Measurement Estimate and Count Unit Squares Activity, studentsestimate how many tiles it will take to cover each plane figure.

Using this Will You Be My Equivalent Valentine Fractions Activity, students match fraction heart cards to the corresponding math problem strip.