Welcome to the Smiling Kangaroo :)

Age + BirthYear = 111

2011-02-05T10:36:00.004+08:00

Two days ago, while CNY visiting, a relative asked me,
"What do you get when you add the last two digits of your birth-year and your current age ?"

My minds does the simple addition and before i could say it, she said, "111, right ?"

"Yeah."

"Why is it always 111 ?"

At that moment after a full lunch,my brains were no match for my stomach.
My mind froze and i promised i would get back to her on this.
No self-respecting Maths 'cher will let this puzzle go unsolved.

So, yesterday, i posted the following solution to her:

btw, it only works for those of us born in 19xx.

Happy Chinese New Year

2011-02-05T10:26:00.001+08:00

i'm off... hopping off... hopping away to find my own burrow !

It's a new year, new resolutions to fulfill.
Old chapter to close and new chapters to begin.

one year since my last post... one month more to my last day.

2011-02-05T08:38:00.000+08:00

The smiling kangaroo hasn't been smiling for a long time.
Instead, she's been sleeping poorly and having a headache most of the time.
It's hard to teach and be an active teacher in this condition.
Taking medications help only for those few hours, but cause more long term problems and reliance.
So, the most logical thing to do: quit teaching in a public school.

Because i like teaching and i enjoy working out maths, i WILL BE BACK !
Perhaps not in a public school.
More likely my own business?
For now, i'll just finish my term of service and take a long break to catch up with loved ones.

There is a time for everything.

daily puzzle

2010-01-30T09:00:00.000+08:00

daily puzzle: binomial expansion

2010-01-29T09:00:00.000+08:00

daily puzzle: integration - area under graph

2010-01-28T09:00:00.000+08:00

daily puzzle: combinatorics

2010-01-27T09:00:00.000+08:00

i like this question.
Wish i could try it in real life.

daily puzzle

2010-01-26T09:00:00.003+08:00

daily puzzle: long division

2010-01-25T09:00:00.000+08:00

daily puzzle: can u guess what this number is ?

2010-01-24T09:00:00.000+08:00

Different people, different cultures & languages.
Likewise for Maths.
Can you figure out what this Babylonian number is ?

daily puzzle: differentiation

2010-01-23T09:00:00.000+08:00

differentiation!

daily puzzle

2010-01-22T09:00:00.000+08:00

daily puzzle: summation ...sigma

2010-01-21T09:00:00.000+08:00

Can you work out this summation ?

daily puzzle: simplify surds

2010-01-20T09:00:00.000+08:00

Daily Puzzle - coordinate geometry

2010-01-19T09:00:00.000+08:00

Common Test dates & Topics

2010-01-18T15:44:00.000+08:00

Just discussed, and here's the info that might interest some of you.

5N EMaths Common Test on 23 Feb:
+ Algebra (including quadratic)
+ Linear Inequalities
+ Sets

4E EMaths Common Test on 23 Feb:
+ Arc Length and Sector Area
+ Quartiles & Percentiles
+ Matrices

4E AMaths Common Test ... sometime in 1st week of March
+ Linear Law
+ Trigo - basic, equations, identities, addition & double angle formula

daily puzzle... spotted the trend ?

2010-01-18T09:00:00.002+08:00

Daily Puzzle Again

2010-01-17T09:00:00.000+08:00

15th daily puzzle...

2010-01-15T09:00:00.001+08:00

Time passes so quickly...
i've been blogging consistently for 15 days !
Hope you've found this entertaining...mildly ?
:P

Maths is a universal language.
No doubt.
But, still there are different symbols used for the same function/effect.
Today's puzzle is a good example.
In S'pore, we would read it commonly as 0.0666666666666666666666666666666666666666666666666666666666666666666666666666666...
Ok, well you get it.
The digit 6 recurrs endlessly... like crazy (that's why we call such numbers irrational.)

So, what's the mystery number, whose reciprocal is approximately 0.0667 (3 sig. fig.)

Daily Puzzle...circles again

2010-01-14T09:00:00.000+08:00

Can you work out what's x ?

Daily puzzle... do u like wednesdays ?

2010-01-13T09:00:00.000+08:00

It's Wednesday already.
Mid-week !
:)

Daily Puzzle: Maths... when numbers are "naturally" "complex"

2010-01-12T09:00:00.000+08:00

If i = sq.root of negative one, can you work out what's the number above ?

Daily Puzzle: New Monday (Term 1 Week 2)

2010-01-11T09:00:00.000+08:00

It's a new monday.
Feel invigorated ?

Here's a puzzle to exercise your mind:

Daily Puzzle...even on a sunday !

2010-01-10T09:00:00.001+08:00

Don't under-estimate the maths you learn in sec sch.
Here's a real-life application:

daily question

2010-01-09T09:00:00.000+08:00

Answer this:

Er...in case u didn't know, AC between bars means the length of AC...

daily question

2010-01-08T09:00:00.003+08:00

Now, here's a question you don't often see.
Do you understand the notation ?

Need an interpretation ?

Let's say, there are two sets.

Set A is the modulus of 2x-3 equivalent to 13.

Set B is -3x + 2 smaller than or equal to -4.

Both sets only contain elements that are real numbers.

(Do you remember what's a real number ?)

So, the question for today is: what elements appear in both sets A and B ?

daily puzzle

2010-01-07T09:00:00.001+08:00

This type of question should be familiar to you.

Let's laugh !

2010-01-06T17:20:00.000+08:00

If a smiling kangaroo's not smiling (cos she had a very bad migraine), then it's time for some humour (gotta relaxz) !

Here's some hospital jokes that my fren just emailed me today.

(Good things must share-share, right ?)

1. A man dashes into the A&E dept. and yells . . 'My wife's going to have her baby in the taxi'.

I grabbed my stuff, rushed out to the taxi, lifted the lady's dress and began to take off her underwear. Suddenly after protests from the lady I noticed that there were several taxis - - - and I was in the wrong one.

2. At the beginning of my shift, I placed a stethoscope on an elderly and slightly deaf female patient's anterior chest wall.
'Big breaths,'. I instructed.
'Yes, they used to be,'. . . replied the patient..

3 One day I had to be the bearer of bad news when I told a wife that her husband had died of a massive myocardial infarct. Not more than five minutes later, I heard her on her mobile phone reporting to the rest of the family that he had died of a 'massive internal fart.'

4. During a patient's two week follow-up appointment, he told me that he was having trouble with one of his medications.
'Which one ?'. . .. I asked.
'The patch; the Nurse told me to put on a new one every six hours and now I'm running out of places to put it!'
I had him quickly undress and discovered what I hoped I wouldn't see. Yes, the man had over fifty patches on his body!
Now, the instructions includes removal of the old patch before applying a new one.

5. A nurse was on duty in the A&E when a young woman with purple hair styled into a punk rocker Mohawk, sporting a variety of tattoos, and wearing strange clothing, entered . . It was quickly determined that the patient had acute appendicitis, so she was scheduled for an immediate operation..
When she was completely disrobed on the operating table, the staff noticed that her pubic hair had been dyed green, and above it there was a tattoo that read . .'Keep off the grass'
Once the surgery was completed, the surgeon wrote a short note on the patient's dressing, which read 'Sorry . . . had to mow the lawn.'

daily puzzle

2010-01-06T09:00:00.001+08:00

Feeling smart ?
Try answering this:

Eh, u know what's a natural number, ya ?

daily question

2010-01-05T09:00:00.001+08:00

Ready for yet another easy question:

daily puzzle

2010-01-04T09:00:00.002+08:00

Try this: what's the answer to:

daily question

2010-01-03T09:00:00.003+08:00

Do you know the answer to this:

Daily question

2010-01-02T22:32:00.000+08:00

Know the answer to this ?

sec 4-9 (2010) Jan test topics

2010-01-02T09:00:00.003+08:00

For those of you who have been following this blog, here's some news that i'll announce when i see you in class. As you know, i enjoy pacing you (winkz), and love to make sure that you do revise your lessons from time to time, while accumulating & assimilating new concepts. So,... ..., yes, i'm planning two tests in Jan 2010.

For EMaths, the test will be conducted one afternoon in early Week 2. The topics are:
+ cumulative frequency
+ box & whisker plot
+ means & standard deviation

For AMaths, the test will be conducted in one afternoon in early Week 3. The topics are:
+ Trigonometric Ratios & General Angles
+ Trigonometric Ratio of any Angle
+ Simple Identities
+ Further Trigonometric Equations

HAPPY NEW YEAR !!!

2010-01-01T22:18:00.000+08:00

Happy New Year everyone !

Do you know the answer to this simple question:
"What is 2 to the power of zero, divided by one to the power of zero ?"

:)

happy last few days of 2009

2009-12-30T17:48:00.001+08:00

Dear students,

dear dear students... today's the 2nd last day of 2009.
i'm looking forward to the new year: another hardworking year of maths and more maths.
Yes, i know we've already worked hard this year.
But i'm certain that next year will be better... more things to do, but more fun to have too !!

i hope we'll continue to relate well with one another, so that we can maximise joy and laughter.
The sweat, i can't cut down, cos i don't control the weather !
As for the tears, i'm hope to minimise the occasions for it... unless they are tears of joy...
But if we do cry, then i'll lend you my shoulder and give you tissue.

Before i start planning how to "torture" you, i wish you very Merry Holidays and a Happy New Year !
:)

the mrbrown show: 20 litres only

2009-12-29T20:01:00.002+08:00

the mrbrown show: 20 litres only

Posted using ShareThis

Something lame and funny. Come on, you're a smart student... can u figure out a logical way to tell whether the petrol tank contains more than 20 litres of M'sian petrol ?

Of course you can. Otherwise, why study chemistry and maths ?!

Standard Deviation (grp Data) Prac Qn 3

2009-11-11T10:23:00.000+08:00

Here's the solution for Standard Deviation (Grped Data) Prac Qn 3.

Notice that the histograms show evidence that grp B scores gather mostly around 50-90, whereas Grp A spread from 10 all the way to 100. This is a clear example of how standard deviation DOESN'T do its job as a measure of consistency.

In Statistics, which is a big branch of Maths, you'll find that you ought to use different measures to calculate and compare. It all depends on what kind of data has been gathered. It's a very big subject area. You'll know more when you enter JC, or if you take up Stats module in Poly Maths or Uni Maths... or, if you just surf the internet !

Standard Deviation Eg4

2009-11-11T10:20:00.000+08:00

As promised, the working for Example 4 in Standard Deviation worksheet (for grouped data).

the origin of the "Smiling Kangaroo"

2009-11-04T08:10:00.000+08:00

i'm just a mere average teacher.

But when working with an above average enthused class, i have no choice but to try new things.

Blogging's been around forever, but i'm still a newbie.

This class is so cute: they wrote about me during their English class, and i found out about it.

Hence, the origin of the "Smiling Kangaroo".

btw, i saw a cat on the way to school this morning.

Doesn't he look like a yummy choc fudge sundae ?

My virgin attempt !

2009-11-03T09:43:00.000+08:00

o wow... the smiling kangaroo's done it !

Starting this blog to upload maths worksheets' answers.

Hope this works.