The purpose of this lesson is to count congruent (equal) shapes to measure area.

Included is a YouTube video to support Grade 4 Blended Learning Math - Unit 4.7: Measurement - Covering Shapes.

The purpose of this lesson is to estimate and find the area in square units.

Included is a YouTube video to support Grade 4 Blended Learning Math - Unit 4.8: Measurement - Exploring Area.

The purpose of this lesson is to introduce the unit of measurement in grade 5 math.

Included is a YouTube video to support Grade 5 Blended Learning Math - Unit 4.0: Measurement - Introduction.

The purpose of this lesson is to explore rectangles with equal perimeters.

Included is a YouTube video to support Grade 5 Blended Learning Math - Unit 4.3: Measurement - Exploring Rectangles with Equal Perimeters

The purpose of this lesson is to explore rectangles with equal areas.

Included is a YouTube video to support Grade 5 Blended Learning Math - Unit 4.4: Measurement - Exploring Rectangles with Equal Areas.

The purpose of this lesson is to explore how to find the area of a rectangle.

Included is a YouTube video to support Grade 6 Blended Learning Math - Unit 6.8: Geometry - Area of a Rectangle.

The purpose of this lesson is to determine the square roots of whole numbers, fractions and decimals that are perfect squares.

Included is a YouTube video to support Grade 9 Blended Learning Math - Unit 1.1: Square Roots and Surface Areas.

The purpose of this lesson is to determine surface areas of composite objects made from cubes and other right rectangular prisms.

Included are the YouTube videos to support Grade 9 Blended Learning Math - Unit 1.3: Square Roots and Surface Areas - Surface Areas Made from Right Rectangular Prisms - Parts 1 and 2.

Through this lesson and its two associated activities, students are introduced to the use of geometry in engineering design, and conclude by making scale models of objects of their choice. The practice of developing scale models is often used in engineering design to analyze the effectiveness of proposed design solutions. In this lesson, students complete fencing (square) and fire pit (circle) word problems on two worksheets—which involves side and radius dimensions, perimeters, circumferences and areas—guiding them to discover the relationships between the side length of a square and its area, and the radius of a circle and its area. They also think of real-world engineering applications of the geometry concepts.

The purpose of this task is to strengthen students' understanding of area. It could be assigned in class to individuals or small groups or given as a homework exercise to generate interesting discussions the following day. The relatively high levels of complexity and technical demand enhance its instructional value.

In this problem set, learners will analyze an image of Washington, DC, taken from orbit. They will determine scale and take measurements of several features in the image. A link to more images taken from the International Space Station and the answer key are provided. This is part of Earth Math: A Brief Mathematical Guide to Earth Science and Climate Change.

Working individually or in groups, students explore the concept of stress (compression) through physical experience and math. They discover why it hurts more to poke themselves with mechanical pencil lead than with an eraser. Then they prove why this is so by using the basic equation for stress and applying the concepts to real engineering problems.

Students develop and solidify their understanding of the concept of "perimeter" as they engage in a portion of the civil engineering task of land surveying. Specifically, they measure and calculate the perimeter of a fenced in area of "farmland," and see that this length is equivalent to the minimum required length of a fence to enclose it. Doing this for variously shaped areas confirms that the perimeter is the minimal length of fence required to enclose those shapes. Then students use the technology of a LEGO MINDSTORMS(TM) NXT robot to automate this task. After measuring the perimeter (and thus required fence length) of the "farmland," students see the NXT robot travel around this length, just as a surveyor might travel around an area during the course of surveying land or measuring for fence materials. While practicing their problem solving and measurement skills, students learn and reinforce their scientific and geometric vocabulary.

Over 270 free printable math posters or maths charts suitable for interactive whiteboards, classroom displays, math walls, display boards, student handouts, homework help, concept introduction and consolidation and other math reference needs.

"The Core Knowledge Foundation provides open access to content-rich curriculum materials for preschool through grade 8, including the Core Knowledge Curriculum Series™, with many materials now available and many more in development."

You will need to provide your email address to download these amazing resources. CK has aligned their ELA to the Science of Reading in collaboration with Amplify Reading.
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Great high school mini courses or units for Math (including solutions).

Quadratics
Exploding Dots
Fractions
Permutations & Combinations
Area

This module brings together the ideas of similarity and congruence and the properties of length, area, and geometric constructions studied throughout the year.  It also includes the specific properties of triangles, special quadrilaterals, parallel lines and transversals, and rigid motions established and built upon throughout this mathematical story.  This module's focus is on the possible geometric relationships between a pair of intersecting lines and a circle drawn on the page.

Find the rest of the EngageNY Mathematics resources at https://archive.org/details/engageny-mathematics.

Try the full EXPLODING DOTS experience! This is a really great deeper learning activity for students.

Videos

Linked to G'Day Math - full of courses.
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KAPOW activities

In this 35-day Grade 3 module, students extend and deepen second grade practice with "equal shares" to understanding fractions as equal partitions of a whole. Their knowledge becomes more formal as they work with area models and the number line.

Find the rest of the EngageNY Mathematics resources at https://archive.org/details/engageny-mathematics.

In this 20-day module students explore area as an attribute of two-dimensional figures and relate it to their prior understandings of multiplication. Students conceptualize area as the amount of two-dimensional surface that is contained within a plane figure.  They come to understand that the space can be tiled with unit squares without gaps or overlaps.  They make predictions and explore which rectangles cover the most area when the side lengths differ.  Students progress from using square tile manipulatives to drawing their own area models and manipulate rectangular arrays to concretely demonstrate the arithmetic properties. The module culminates with students designing a simple floor plan that conforms to given area specifications.

Find the rest of the EngageNY Mathematics resources at https://archive.org/details/engageny-mathematics.