Angles

An angle is formed by two rays that share a common endpoint, called the vertex. Angles are measured in degrees, and the size of an angle is determined by the amount of rotation from one ray to the other.

There are different types of angles:

Acute Angle: An angle that measures between 0 and 90 degrees.
Right Angle: An angle that measures 90 degrees. It forms the shape of an "L".
Obtuse Angle: An angle that measures between 90 and 180 degrees.
Straight Angle: An angle that measures 180 degrees. It forms a straight line.
Reflex Angle: An angle that measures between 180 and 360 degrees.

Angles can be identified using a protractor, and they are used in various geometric and trigonometric calculations.

◂Math Worksheets and Study Guides Third Grade. Estimation

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The resources above cover the following skills:

Number and Operations (NCTM)

Understand numbers, ways of representing numbers, relationships among numbers, and number systems.

Understand the place-value structure of the base-ten number system and be able to represent and compare whole numbers and decimals.

Compute fluently and make reasonable estimates.

Develop and use strategies to estimate the results of whole-number computations and to judge the reasonableness of such results.

Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.