## Monday, 31 July 2017

### Revisiting what we learnt...

Make a guess!
Enter your answer in "Comments"

source: https://brilliant.org/

## Saturday, 29 July 2017

### Beautiful Mathematics: Geometry and Origami

Original Facebook Post (click HERE)

## Thursday, 27 July 2017

### [Follow-up] Today's Lesson

Refer to the following posts for lessons conducted this week (Key Focus: Data Handling)

Things to complete - Compulsory

1. 2015 Level Test 2 Revision (Deadline: 31 July 2017)

2. Maths Blog activities (Deadline: 28 July 2017)
3. Google Classroom
• Task 1: Data Handling (Deadline: 28 July)

• Task 2: Linear Graphs (Deadline: 27 July)

### [Homework 1] Quizzes: Bar Graph vs Histogram..... Dot Diagram

Complete the following by Saturday (29 July 2017, 12 noon)

(A) Click HERE to access Quiz 1: Histogram, Frequency Table, Mean-Median-Mode
• Click HERE to view responses

(B) Click HERE to access Quiz 2: Dot Diagram
• Click HERE to view responses

### [Homework 2] Reporting Data in an Appropriate & Objective Manner

We looked at a few examples that illustrate how data, when not presented partially or appropriately might lead to strong reactions from the reader.

Discussion 1: Is the difference of the rate really that 'great'?
Source: The Straits Times (26 July 2017)

Discussion 2:
1. What was the message the charge trying to convey?
2. What was misleading about the chart?
3. What could be done to make the information presented more objectively and appropriate?

Study Notes (p24) Misleading Information in Statistics

Note: You should have recorded your responses to the three questions in your study notes.

Task 1 (to be completed by Friday, 25 July)
Study Notes (p24)

Click HERE to open the padlet

Task 2 (to be completed by Friday, 25 July)
Study Notes (p25)

Click HERE to open the padlet

### Summary: FOUR stages of a Statistical Study (Study Notes, p26)

Today, we went through the various stages of Data Handling.

The slides presented an summary.
Click HERE for the slides.

### Data Handling: How data is used to make recommendations (1)

Below is an example on how data is gathered among 10 countries, when recommendations are made to based on the trends surfaced over time.

Influenza seasonality and vaccination timing in tropical and subtropical areas of southern and south-eastern Asia

This is a screenshot of the data presented for Singapore and three other ASEAN countries.

### Knock! Knock! How many doors do you have?

Click HERE to view the discussion (to revisit MEAN, MEDIAN, MODE) we had in March.

During the lesson, we discussed

(1) How the median would be affected if we add the 25th data point to the collection.

If the new data point contributes "9 doors" to the collection, the updated frequency table will become:

Now, the median would be refer to the number of chairs the 'middle' person (i.e. the 13th person)
= 9 doors

(B) How the OUTLIER would affect the mean if the person has 0 doors instead of 18

## Wednesday, 26 July 2017

### Data Handling: What does data tell us?

Report by Straits Times on 25 July 2017 (Tuesday):
SMS usage falls amid rise of chat apps, soft tokens
Source of image (above website)

Study the chart carefully.

What does the line graph "tell" us about the use of SMS in Singapore?

• Are you able to "guess" the "ups" and "downs" (i.e. the trends) illustrated in the line graph - before reading the article
• Can you infer what has happened over the technology landscape in Singapore the years?

Type A

LINK

Type B

LINK

Type C

LINK

## Tuesday, 18 July 2017

### [Follow-up] Today's Lesson

Today's lesson focused on 'understanding' the relationship between a given equation and the graph through the blog activities (below).

What's new today?
Sketching of Graphs
We only went through p23 very quickly.

To attempt Class Work 1 (Tier B) - and post your answers (b) & (c) in Google Classroom - to be completed by Wednesday (19 July 2017)
1. Watch the two video clips in the next post
2. Look out for the steps to find the information (i.e. the x and y-intercepts) that would enable us to sketch a graph.
3. Then attempt (b) and (c)

Homework - to be submitted on Thursday (20 July 2017)
Assignment 9.5

### Study Notes (p25) Graph Sketching - How to do it systematically...

Demonstration on Part (a) y = 2x + 3

Demonstration on Part (d) 0.5x - y = 2.5

### Riddles! Riddles! Riddles!

LINK

Click HERE to view responses

### Differentiating the right from the wrong.... But What's Wrong?

1. Examine the 3 workings and identify which is the correct working.
2. Are you able to tell what goes wrong in each of the two other working.

## Thursday, 13 July 2017

### [Follow-up] Today's Lesson

Key items covered today:
• Graph Plotting: Study Notes (p10)
• Discussion includes
• How to obtain values of x in the table for plotting
• Description of the two linear graphs plotted
• Submission of Activity 1 on pre-printed grid paper
• Graph Plotting - to be submitted in Google Classroom: Study Notes (p11)
• To be submitted in Google Classroom by today (13 July 2017)
• Both Class Work 1 and Class Work 2
• For each task, 2 photos: The graph and the 'sub-questions'
• Behaviour of Graphs
• Through Activity 1 (p12), we discussed the behaviour of "c" when "m" is constant
• Concluding discussion:
• Question: Are these 2 graphs parallel? and Why?
• Graph A: y = 4x
• Graph B: 4y = 20x + 16
Homework
• To be completed by next Monday 17 July 2017:
• Assignment 9.3 - to be submitted
• Study Notes - attempt on your own up to p22 (for discussion on Monday)

## Tuesday, 11 July 2017

### Spot the Errors (I) Study Notes (p9)

Let's assess this graph and point out what are the missing/ redundant components in this graph.
On your own.... List them in points under comments.

### Summary: Drawing Linear Graphs

For clarity in illustration, ink is used in this 'demonstration'.
You should use a sharp pencil, and ruler to plot your graph. Always get ready an eraser to clean off any irrelevant markings.

Step 1: How do we decide where to place the axes?
• Do you "know" the graph paper?
• What would you make reference to?

Step 2: Scale matters!
• The numbers on the axes must be clearly marked.
• The scale should be written on the top right corner of the graph paper.

Step 3: Let's start plotting!

• Mark the points clearly with "X"
• Join the points with a straight line (use a long ruler!)
• The line should be drawn within the given domain

### Error Analysis: Marking Scales

Click HERE to watch

Note: This set of slides will be made viewable after the class discussion.

## Monday, 10 July 2017

### Study Notes (p7) Activity 1 Question 3 - For discussion

Below are the charts presented by the groups:

Which graph do you think represents the given scenario best?

Click HERE to find out more...

### [Follow-up] Today's Lesson

Today, we discussed the following:
• Indiana Jones' Problem
• With the table of values, we found the relationship between the height of the position of the temple and time
• What is an independent variable and what is a dependent variable
• Assignment 9.1 Question 3
• The key is to read the diagram carefully: Area of the first square is 2 square unit
• Study Notes (p3) Activity 1
• Area of Trapezium (Click HERE to see how to derive the formula)
• Study Notes (p3) Activity 2
• Study Notes (p4) Activity 3
• Study Notes (p4) Activity 4
• Study Notes (p6) Example 2
• The key discussion point is part (c): the context determines to what extent the graph is valid.
• Study Notes (p7) Activity 1 Question 3
• For discussion in next lesson
• Preparation
• Bring graph paper, long ruler and sharp pencil for next lesson

## Saturday, 8 July 2017

### [Follow-up] From Thursday's lesson & Getting Ready for Monday's lesson

On Thursday's lesson, we started the topic, Functions and Linear Graphs and the key points were
• Knowing the "nomenclature" of the Cartesian Plane
• Being PRECISE: horizontal, vertical, rows, columns, x-y axes, intercepts, gradient
• Word Search Activity; Study Notes
• Gradient: What is it? How to describe gradient? How gradient is calculated (linking it to Physics & Geography)
• Discussion of selected questions in the Diagnostic Test handout
• Knowing the "parts":  Y = mX + c
• Introduction of Relationships through "Jack & the Bean Stalk" & "Indiana Jones"
Practices to complete:
Getting Ready for next lesson (Flipped activity)

## Thursday, 6 July 2017

### [Homework] When Little Red Riding Hood meets Wolfie!

Direct LINK to the GoogleForm

Click HERE to view responses

### [Flipped Activity] Getting Ready for Next Lesson

Read up Study Notes p5 to p9 - attempt the activities.

Watch the collection of videos (below) - It is critical to know the Graph Paper and know how to draw/ plot on the graph paper well

### [Flipped Activity] Introduction to Graphs

Attempt this section before the next lesson

Activity 1: Getting the most with straight lines

Click HERE to access game

Activity 2: Applying Linear Equations

Click HERE to access the game

In Summary
Direct link

### [Homework] Lines tell stories

The diagram shows a distance-time graph.
Study the graph carefully, paying attention to the slopes (i.e. the speed), the pauses, the time taken and the distance.

Write a story that takes into account the 'movement' of Raj and Michael.
• It should include information like where they begin their journey.
• It should also take into account the distance they travel, the speed they travel at, what happened during the pauses, etc.
Share your story in the "Comments"

adapted from New Syllabus Mathematics (7th edition) p171

### Reading Values from Graphs

Click HERE for direct link

Click HERE to view responses

## Tuesday, 4 July 2017

### Construction of Parallel Lines

Reference: Handout - Fun with Construction (activity carried out on 29 June 2017, Thursday) (p2)

Construction of Parallel lines

Paul's method (by Hafiz)

Pauline's method (by Ethan)

Other methods to draw/ construct parallel lines; however, might be difficult when need to draw/ construct two parallel lines when given a specific distance between the two lines.

By Yi Ming - construction of two equilateral triangles

By Christabel - construction of 2 perpendicular lines

How do we verify if two lines are parallel?

Method 1 (by Christabel)

Method 2 (by Annie)

### 20170703 For Discussion - Assignment 1 Q1

Spot the difference!

Examine the diagrams below carefully.

Diagram 1 scores 5 out of 5.

Diagram B scores 4 out of 5 points
What is wrong with this diagram?

Click HERE to view the Step-by-Step Guide to construct the diagram.

### 20170703 For Discussion - Assignment 1 Q2

Examine the diagrams carefully.

Diagram 3 scores 7 out of 7 marks

Diagram 4 scores 5 out of 7 marks. Why?

While the following diagram has met all the requirements, it is not acceptable.
Why?

Click HERE to view the step-by-step guide to construct the diagram.