Give a creative idea how to begin a lesson. The academic subject for which the text must be created - Mathematics. It should be for students...
Lesson start ideasGive a creative idea how to begin a lesson
Which subjectMathematics
What age groupYear or Grade 11
What topicalgebra
Any other preferences

Introducing algebra can be quite daunting for learners. With various formulae and concepts to remember, it's important to start off on the right foot. Here's an engaging way to spark interest and introduce algebra to your Year/Grade 11 students.

The Mystery Number

To begin the lesson, let's dive into a mystery. Think of a number between 1 and 10. Double that number, divide it by 2, add 3, divide it by 3, and finally subtract 1. When you arrive at your final number, let's call it 'n', keep it in your mind.

Can you guess the mystery number?

We'll revisit this later in the lesson. For now, let's move on to the basics of algebra.

What is Algebra?

Algebra is a branch of mathematics where letters and symbols are used instead of numbers. We use algebra to solve equations and understand the relationship between variables.


In algebra, variables are the letters or symbols that represent a value that can change. The most common variables used in algebra are x and y.

Algebraic Expressions

An algebraic expression is a combination of variables, constants, and arithmetic operations. For example, 2x + 3 is an algebraic expression.

Algebraic Equations

An algebraic equation is a statement that two expressions are equal. Equations involve using algebra to solve for a specific variable. For example, 2x + 3 = 9.

Now that we've covered the basics of algebra, let's go back to our mystery number.

What is your mystery number, 'n'?

Let's use algebra to figure out the mystery number. If we start with the mystery number 'n', we can work backward through the formula to solve for it.

(n - 1) * 3 = mystery number 3n - 3 = mystery number 3n = mystery number + 3 n = (mystery number + 3)/3

Amazing! You've just used algebra to solve a mystery! Algebra is a powerful tool that can be used to solve even more complex problems. Let's explore this further in upcoming lessons.


Great work, class! We've covered the basics of algebra by solving a mystery. Next time, we'll dive into more complex equations and explore how algebra is used in the real world.