Activity 1:

Watch the movie, X finds out his value, and answer the following questions.

Given the following:

2x + 4 + x = 8 + 2(3 + x) -3

- Is this an expression or an equation? Why?
- What is the variable?
- Why is an equation like a see-saw?
- Simplify 2x + 4 + x Answer: ___________________
- Simplify 8 + 2(3 + x) -3 Answer: ___________________
- Solve the above for x Answer: x = ________________

*The objective of the activity is to use concrete representation to find the unknown variable. Algebraic reasoning is used to solve or find the numerical value of the variable. *

- Levels 1 and 2 contain two scales.
- Level 3 is more difficult and has three scales.
- Your goal is to determine the weight of one or more of the objects.

Click HERE to attempt.

Source: Math Playground (retrieved: 14 March 2010)