### Chap 16 (Class Activity) Stem-and-Leaf Diagrams - Our Worst Haze Days

Reference: Worksheet 4 (p2) Constructing a Stem-and-Leaf Diagram...

Because of Singapore's geographical location, we are impacted by smoke haze when there are forest fires in the region and the prevailing southwest monsoon winds blow the smoke from the fires in our direction, which usually occur in the period of May to October.

In the past 10 years, Singapore has experienced several "worst" haze days.

Let's complete the back-to-back stem-and-leaf diagram that shows the PSI (Pollutant Standards Index) values of the two such instances in the decade and make a comparison of these 2 haziest periods.

The PSI values of 2006 October is shown in the table below (left).

Comment on the Median PSI value in 2006 October.
Are you able to tell the mean and mode from the stem-and-leaf diagram?

Now, visit the NEA website to find out what the PSI value of the days in June 2010.
Complete the table in the worksheet, and make a comparison between the 2 sets of data.

### Chap 16 (Class Activity) Dot Diagrams - Weather in Singapore

Reference: Worksheet 3 (p2): Constructing a Diagram to do comparison

In a travel guide about Singapore, it was highlighted that "The Temperature hovers around a diurnal range of a minimum of 23 degree celsius, and a maximum of 31 degree celsius. June is the hottest month of the year in Singapore, followed by May. "However, in 2010, February was reported to be the driest month.

Let's do a comparison using the dot diagram, to compare the temperature in February 2010 and June 2010.

Below is the dot diagram that represents the maximum temperature of each day recorded in June 2010.

Find out the mean, mode and median of the maximum temperature of month June 2010.

Here's the temperature of each day recorded in February 2010.

Draw a dot diagram and compare it with that for June 2010.

### Closure... Maths Class 2012

Dear S1-02

It's been a pleasure to be with you on your maiden learning journey in SST :)

In our attempt to make the learning experience more enriching and to bring out the "SST Flavour: Applied Learning with Technology use", several "new" approaches were introduced over the past few months. To name a few:
• 6 AM Quiz
• Story Marathon @ Facebook that bring a twist
• "Coffee Table book" @ Facebook on the topic of Geometry
• Outdoor Data Collection Mission (eLearning activity cum Performance Task)
• Problem Solving related to real life (e.g. The Cornfield Corn)
• Hands-on activities like folding of rectangular sheets to learn about expansion
• Formative assessment before the major assessments
• Assessment through Viva Voce (Practice & Performance task)
• Activities such as analysing the PSI values of different parts of Singapore at different times of the year
• Creating Posters for the topic on Estimation
• ...
Remember to attempt the closure survey posted at the GoogleSite (Announcement Page), which would be very helpful in shaping the kind of learning experiences you would like to have in the following year.

### Construction: Key Ideas

1. Equidistance from a point (circle)
2. Equidistance from a line (parallel lines)
3. Equidistance from 2 lines (angle bisector)
4. Equidistance from 2 points (perpendicular bisector)
5. Construction of Triangle 6. Construction of Quadrilateral

### (20120919) Preparation for NEXT LESSON

Dear all

Please bring along with you the following in the next lesson on Construction of Angles and Lines:
CONSTRUCTION Set

• Ruler
• Pencil (sharp)
• Compass
• Protractor

Do you know... that different countries use different "units" to describe speed?

Mr Yeo recorded (in his device) his cycling speed as 24 mph (miles per hour), which is definitely different from 24 km/h (kilometres per hour, which is more commonly used in Singapore) From the image,
(1) Are you able to tell how fast did Mr Yeo cycle in terms of km/h?
(2) Would you have enough info to derive a figure that helps us to do the conversion from mph to km/h very quickly?

### Let's try to Interpret...

This is something that Mr James Koh recorded about his ride on last Sunday:

### Let's compare: Average Speed

Click at the click to view "comparisons":

Now, click at the LINK to respond to the questions.

### Term 4 Week 2: Getting Ready & Materials to bring

Dear Students

We have almost completed (S2) Algebra - Factorisation.
Please bring along your Maths Textbook 1B and the Homework Handouts for Chap 9 & Chap 10 for lessons next week.

### Submission of Performance Task (as at 13 Sep 2012, 2359)

Dear S1-02

Thanks for submitting your performance on time. Well Done!
I've checked the entries.
Qadirah needs to re-do the task because she has not responded to the question that belong to ones given in the Task.