Illustrative Mathematics
Illustrative Mathematics: 3.g Representing Half of a Circle
This task asks which pictures represent half of a circle? Moving into more complex shapes where geometric arguments about cutting or work using simple equivalences of fractions is required to analyze the picture. Aligns with 3.G.A.2.
Illustrative Mathematics
Illustrative Mathematics: 3.md the Square Counting Shortcut
This is a rectangle subdivision task; ideally instead of counting each square. students should break the letters into rectangles, multiply to find the areas, and add up the areas. Aligns with 3.MD.C: CCSS.Math.Content.3.MD.C.6 Measure...
Illustrative Mathematics
Illustrative Mathematics: 3.md Three Hidden Rectangles
The purpose of this task is for students to decompose a figure into rectangles and then find the total area by adding the area of all of its smaller, non-overlapping rectangles. Aligns with 3.MD.C.7.d.
Illustrative Mathematics
Illustrative Mathematics: 3.md Shapes and Their Insides
The purpose of this task is to help students differentiate between a polygon and the region inside of a polygon so that they understand what is being measured when the perimeter and area are being found. Aligns with 3.MD.D.
Illustrative Mathematics
Illustrative Mathematics: 3.oa Two Interpretations of Division
Students practicing dividing and application of division. Aligns with CCSS.Math.Content.3.OA.A.3 Use multiplication and division within 100 to solve word problems
Illustrative Mathematics
Illustrative Mathematics: 3.nf Comparing Fractions With a Different Whole
This task is meant to address a common error that students make, namely, that they represent fractions with different wholes when they need to compare them. Aligns with CCSS.Math.Content.3.NF.A.3.d Compare two fractions with the same...
Illustrative Mathematics
Illustrative Mathematics: 3.nf Comparing Fractions
The purpose of this task is for students to compare fractions using common numerators and common denominators and to recognize equivalent fractions. Aligns with CCSS.Math.Content.3.NF.A.3.a Understand two fractions as equivalent (equal)...
Illustrative Mathematics
Illustrative Mathematics: 3.nf Ordering Fractions
The purpose of this task is to extend students' understanding of fraction comparison and is intended for an instructional setting. Aligns with 3.NF.A.3.
Illustrative Mathematics
Illustrative Mathematics: 3.oa Markers in Boxes
The purpose of this task is for students to compare two problems that draw on the same context but represent the two different interpretations of division, namely, the How many groups? interpretation and the How many in each group?...
Illustrative Mathematics
Illustrative Mathematics: Fraction Comparisons Pictures, Assessment Variation
This task is about comparing two fractions with the same numerator or the same denominator by reasoning about their size, and understanding that such comparisons are valid only when the fractions refer to the same whole. Aligns with...
Illustrative Mathematics
Illustrative Mathematics: Comparing Fractions Same Numerator, Assessment
This task is about comparing two fractions with the same numerator or the same denominator by reasoning about their size, and understanding that such comparisons are valid only when the fractions refer to the same whole. Aligns with...
Illustrative Mathematics
Illustrative Mathematics: Comparing Fractions Same Denominator, Assessment
This task is about comparing two fractions with the same numerator or the same denominator by reasoning about their size, and understanding that such comparisons are valid only when the fractions refer to the same whole. Aligns with...
Better Lesson
Better Lesson: Partitioning Rectangles and Squares
This site provides six practice activities to learn how to partition a rectangle into rows and columns of same-size squares and count to find the total number of them.
CK-12 Foundation
Ck 12: Elem Math: Identifying Semi Circles and Quarter Circles
[Free Registration/Login may be required to access all resource tools.] The video defines a semi-circle and a quarter-circle and answers a question determining which object is a semi-circle. The video is followed by a series of practice...
CK-12 Foundation
Ck 12: Elem Math: Count Rectangles, Square,s and Triangles in Composite Figures
[Free Registration/Login may be required to access all resource tools.] The video defines a composite shape and shows how to determine the total number of triangles in the given shape. The video is followed by practice problems to assess...
CK-12 Foundation
Ck 12: Elem Math: Counting Semi Circles and Quarter Circles in Composite Figures
[Free Registration/Login may be required to access all resource tools.] The video defines composite figures, semi-circles, and quarter circles, then uses those definitions to determine how many semi-circles and quarter circles are in the...
Khan Academy
Khan Academy: Equal Parts of Circles and Rectangles
Practice telling if shapes are divided into 2 or 4 equal sections. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a tutorial video, or receive hints.
Alabama Learning Exchange
Alex: Share and Share Alike (Equal Parts)
This Five E's AMSTI lesson plan equips students to divide an object into equal parts. A story and interactive whiteboard activity about sharing food demonstrate the idea of equal halves of circles, after which students attempt to half...
Better Lesson
Better Lesson: Fractions of Time and Money
People talk about quarters of the hour, or quarters in a dollar. This lesson lets students in on what that means.
Better Lesson
Better Lesson: Filling in the Middle
Students use both area and perimeter to work with geometric shapes.
Better Lesson
Better Lesson: Fractions Can Be Fun
Second graders recognize what it means to fold a paper in half, but do they recognize how to create fourths or thirds?
Better Lesson
Better Lesson: Identifying 2 D Shapes
For this activity, 2nd graders will identify shapes found around the room by recognizing their attributes such as number of angles, vertexes, and faces.
Better Lesson
Better Lesson: A Whole and Its Parts
Second graders take fractions apart and put them back together to form a whole.
Better Lesson
Better Lesson: 3 Digit Perimeters
Second graders work with 3-digit numbers as they solidify their understanding of the difference between perimeter and area.