Median is basically the middle number of a set of numbers, in either increasing or decreasing order. If there are odd number of numbers, there will only be one middle number. But if it even, you will have to take the sum of the 2 numbers and divide them by 2.

# 2011 S2-05 Maths Blog

## Friday, February 11, 2011

### Median and Mean

Median is basically the middle number of a set of numbers, in either increasing or decreasing order. If there are odd number of numbers, there will only be one middle number. But if it even, you will have to take the sum of the 2 numbers and divide them by 2.

### Week 6

**Completing the Square**

The picture shows how to complete the square. Firstly, you have to focus on the first 2 terms(ax²+bx).

With that, you make the equation to

a²+2ab+b²

You will add a 'b²', and thus you will have to subtract a 'b²'.

The second picture shows how x²=2x. Since y=x² and y=2x, y=y, x²=2x

This picture shows how to solve the question, making the equation to ax² +bx + c=0

1. Factorise

2.Combine fractions(LCM)

3.Eliminate fractions(Multiply by denominators throughout)

Reminder:

1.When using the general formula, we must make sure that the right hand side of the equation is equal to 0, or you result will not be the correct answer.

2. Do not solve 2 equations separately, instead, combine these 2 equations together.

3. Keep improper fractions as it is a waste of time to keep switching from improper to proper fractions.

e.g. Find the sum of 3/2 and 2/4

3/2=1½

1½+ ²/₄

=3/2 + 2/4

=6/4 + 2/4

=8/4

=2

4. Keep fractions when solving the questions, or as the final answer; Decimals are confusing.

## Friday, January 28, 2011

### Math Recap 24-28/01/2011 Term 1

## Saturday, January 22, 2011

### This weeks recap (17/1/11 - 21/1/11)

## Monday, January 17, 2011

### Summary T1 W2 (10 January - 14 January)

**For this week, we recapped that:**

Note:

a²+b² is NOT equals to (a+b)²

a²+b is equal to (a+b)²-2ab

c) via common factors

b) via perfect square

a²+4a+4= (a)² + 2(a)(2)+(2)² = (a+2)²

c) via trail and error

d) via grouping

**For this week, we have done these examples:**

Example 03:

***Take Note!**

- Factorize the denominator of the fraction independently
- If there are two separate fractions, factorize each fraction it by itself
- Find the LCM of both the fractions
- Make the two fractions into one.