The mean, also known as the average, is a measure of central tendency. It is calculated by adding up all the values in a set of numbers and then dividing by the total number of values.

To calculate the mean of a set of numbers:

- Add up all the values in the set
- Count the total number of values in the set
- Divide the sum by the total number of values

Let's calculate the mean of the following set of numbers: 5, 7, 11, 15, 21.

Step 1: Add up all the values: 5 + 7 + 11 + 15 + 21 = 59

Step 2: Count the total number of values: 5

Step 3: Divide the sum by the total number of values: 59 / 5 = 11.8

So, the mean of the set is 11.8

- Practice calculating the mean of different sets of numbers
- Understand the concept of central tendency and how the mean represents it
- Review real-life examples of when the mean is used, such as in sports statistics or financial reports

The mean is the average of a set of numbers, calculated by adding up all the values and then dividing by the total number of values.

Study GuideMore Multiplication Activity LessonMultiplication Stars Worksheet/Answer key

More Multiplication Worksheet/Answer key

More Multiplication Worksheet/Answer key

More Multiplication

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.

Grade 4 Curriculum Focal Points (NCTM)

Number and Operations and Algebra: Developing quick recall of multiplication facts and related division facts and fluency with whole number multiplication

Students use understandings of multiplication to develop quick recall of the basic multiplication facts and related division facts. They apply their understanding of models for multiplication (i.e., equal-sized groups, arrays, area models, equal intervals on the number line), place value, and properties of operations (in particular, the distributive property) as they develop, discuss, and use efficient, accurate, and generalizable methods to multiply multi-digit whole numbers. They select appropriate methods and apply them accurately to estimate products or calculate them mentally, depending on the context and numbers involved. They develop fluency with efficient procedures, including the standard algorithm, for multiplying whole numbers, understand why the procedures work (on the basis of place value and properties of operations), and use them to solve problems.