This is a great animated powerpoint that presents 8 algebraic expressions for students to practice simplifying by combining like terms. There are 2 slides for each practice problem. The first slide in each pair shows only the problem, giving students a chance to simplify the expression on their own. The second slide uses color and animation to illustrate the like terms and show how to combine them to get to the answer (see preview).
The expressions (shown below) progress from simple to more complex.
1) 7 + y + 2y
2) 3x - 5 + x
3) 6x + 2x - 3y - 5y
4) 4 - 2a + a + 8
5) -7m + 2p - m - 9p
6) 5x^2 - 6x - 8x^2 - 3x
7) -p + 2 - 9p^2 - 4p - 7 + 9p^2
8) 10g^2 - 8g + 1 - 2g + 11 - 5g^2
Click to advance the slides and click to start the animation on the answer slides.