Isosceles Triangle

An isosceles triangle is a type of triangle that has two sides of equal length. This means that two of the three sides of the triangle are the same length, and the angles opposite these equal sides are also equal. The third side, called the base, can be a different length.

In an isosceles triangle, the two equal sides are called legs, and the angle formed by these two sides is called the vertex angle. The base angles are the angles formed by the legs and the base of the triangle, and they are always equal to each other.

The properties of an isosceles triangle make it useful in various mathematical and real-world applications. For example, in geometry, the symmetry and equal angles of an isosceles triangle make it a key shape in understanding the properties of triangles and other polygons. In architecture and engineering, the concept of isosceles triangles is important for designing and constructing structures with symmetrical and balanced features.

◂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.