Right Angles

A right angle is a 90-degree angle, which is formed when two lines or line segments meet each other perpendicularly. In a right angle, the two lines are perpendicular to each other, meaning they form an "L" shape.

The symbol for a right angle is a small square placed in the corner where the two lines meet.

Right angles are commonly found in many geometric shapes, such as squares, rectangles, and right-angled triangles.

In terms of measurement, a right angle measures exactly 90 degrees. This means that if you were to place a protractor at the vertex of a right angle, the protractor would read 90 degrees.

Understanding right angles is important in geometry and spatial reasoning, as they are fundamental to understanding the properties of shapes and angles.

◂Math Worksheets and Study Guides Third Grade. Place Value

Matching Decimal Cards

Worksheet/Answer key

Matching Decimal Cards

Worksheet/Answer key

Matching Decimal Cards

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.

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.

Connections to the Grade 3 Focal Points (NCTM)

Number and Operations: Building on their work in grade 2, students extend their understanding of place value to numbers up to 10,000 in various contexts. Students also apply this understanding to the task of representing numbers in different equivalent forms (e.g., expanded notation). They develop their understanding of numbers by building their facility with mental computation (addition and subtraction in special cases, such as 2,500 + 6,000 and 9,000 - 5,000), by using computational estimation, and by performing paper-and-pencil computations.