Formulae (plural for formula) is often used to illustrate a

**relationship**among factors (variables).

**e.g. 1: Area of a rectangle**

The formula illustrates a relationship between area, length and breadth

- Area of Rectangle = Length x Breadth
- When the length of the rectangle increases, the area of the rectangle also increases
- When the breadth of a rectangle decreases, the area of the rectangle also decreases

**e.g. 2: Percentage change**

The formula illustrates a relationship between percentage changes, the difference and the original amount

- Percentage change = ( Difference ÷ Original amount ) x 100%
- When the
*Difference*between the original and new amount is large, the percentage change is large

**You are going to...**In your group, look up for as many formula as you could and post them in the padlet designated to your group.

**Instructions:**

- One formula per post-it
- You need to tell us what does the formula do?
- Each formula exists for a purpose (to help us find out/ compute certain things)
- You may use keynote or Pages to present your answer. Save it as an image and post it in the padlet designated to your group.
**Complete this task by 18 March - Ready for discussion on Thursday (19 March)**

Follow-up from lesson:

**Instructions**

Source: Textbook - Read p119 to p121

Attempt the following section in the AceLearning portal:

**Evaluation of Algebraic Expressions and Formulae**to learn how the "substitution" is applied to find unknowns in various fields.

- In particular, examples 6 to 9

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