Math Games For The Classroom
Algebra Tricks

Using math games for the classroom make learning math a more enjoyable and meaningful experience for students! This is a great activity to use in your classroom for teaching pre-algebra concepts.

Topics: Algebra (variables)

Grades: 4 - 8

Concepts: • Variable

Knowledge and Skills: • Can translate a mathematical relationship described in words into an expression,

Materials ( for each student):

• 1 plastic resealable bag, containing 10 small discs (roughly 1" in diameter) 2 other objects which are identical to each other but different from and somewhat larger than the discs (these objects could be wooden blocks, plastic construction bricks, or geometric shapes cut from construction paper or cardboard)
• 1 calculator (optional but recommended)

Procedure:

1. Before class, write the number "3" large on the blackboard and cover it.
2. Tell students that they are going to learn some of the "magic" of algebra. Ask each student to think of a number, write it down, and enter it into their calculator. Tell them not to let anyone else see what's on their calculator, especially you. (If calculators aren't available, have students do the following operations on paper.)
3. Then have them a) add 5 to their number, b) multiply the result by 2, c) subtract 4 from that result, d) divide the answer by two, and e) subtract the original number. Remind them not to show the answer to anyone.
4. Tell the students that you are going to use the magic of algebra to make the answer jump from their calculators to the blackboard behind you. Then reveal the "3" on the board.