In mathematics, operations are the basic calculations that we use to solve problems and work with numbers. The four basic operations are addition, subtraction, multiplication, and division.

Addition is the process of combining two or more numbers to find their total. The symbol for addition is "+". For example, 3 + 4 = 7.

Subtraction is the process of taking one number away from another. The symbol for subtraction is "−". For example, 7 - 3 = 4.

Multiplication is the process of adding a number to itself a certain number of times. The symbol for multiplication is "×" or "*". For example, 3 × 4 = 12.

Division is the process of dividing a number into equal parts. The symbol for division is "÷" or "/". For example, 12 ÷ 4 = 3.

**Example**: What is the sum of 5 and 8?

**Answer**: The sum of 5 and 8 is 13.

**Example**: What is the difference between 10 and 6?

**Answer**: The difference between 10 and 6 is 4.

**Example**: What is the product of 7 and 9?

**Answer**: The product of 7 and 9 is 63.

**Example**: What is the result of dividing 20 by 5?

**Answer**: The result of dividing 20 by 5 is 4.

Study GuideArea and Circumference of Circles Activity LessonArea of Circles Activity LessonCircumference of Circles Worksheet/Answer key

Area and Circumference of Circles Worksheet/Answer key

Area and Circumference of Circles Worksheet/Answer key

Area and Circumference of Circles Worksheet/Answer key

Area and Circumference of Circles

Geometry (NCTM)

Use visualization, spatial reasoning, and geometric modeling to solve problems.

Use geometric models to represent and explain numerical and algebraic relationships.

Measurement (NCTM)

Apply appropriate techniques, tools, and formulas to determine measurements.

Select and apply techniques and tools to accurately find length, area, volume, and angle measures to appropriate levels of precision.

Develop and use formulas to determine the circumference of circles and the area of triangles, parallelograms, trapezoids, and circles and develop strategies to find the area of more-complex shapes.

Connections to the Grade 6 Focal Points (NCTM)

Measurement and Geometry: Problems that involve areas and volumes, calling on students to find areas or volumes from lengths or to find lengths from volumes or areas and lengths, are especially appropriate. These problems extend the students' work in grade 5 on area and volume and provide a context for applying new work with equations.