A right triangle is a type of triangle that has one angle measuring 90 degrees, known as the right angle. This makes the other two angles acute, meaning they are less than 90 degrees. The side opposite the right angle is called the hypotenuse, and the other two sides are called the legs.

The Pythagorean Theorem can be used to find the length of the sides of a right triangle. The theorem states that the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b). In equation form, it is written as:

c² = a² + b²

Right triangles are used in various mathematical and real-world applications, such as in trigonometry to solve for unknown angles and side lengths, in engineering and construction to calculate measurements, and in navigation to determine distances and directions.

Additionally, the concept of similar right triangles allows for the development of trigonometric ratios such as sine, cosine, and tangent, which are fundamental in solving problems involving right triangles.

◂Math Worksheets and Study Guides Third Grade. Double Digit Subtraction

Study Guide

Double Digit Subtraction

Worksheet/Answer key

Double Digit Subtraction

Worksheet/Answer key

Double Digit Subtraction

Worksheet/Answer key

Double Digit Subtraction

Worksheet/Answer key

Double-Digit Subtraction

The resources above cover the following skills:

Number and Operations (NCTM)

Compute fluently and make reasonable estimates.

Develop fluency in adding, subtracting, multiplying, and dividing whole numbers.

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.

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.

Right Triangle

◂Math Worksheets and Study Guides Third Grade. Double Digit Subtraction

The resources above cover the following skills: