# IntMath Newsletter: Math for plumbing, MS Math 4, SGD

By Murray Bourne, 21 Aug 2011

21 Aug 2011

In this Newsletter:

1. Learn math for plumbing?

2. Microsoft Mathematics 4.0 - now for $0

3. Singapore dollar - backed by gold

4. Friday math movies

5. Poll results

6. Puzzles

7. Final thought: Shaping our lives

## 1. Learn math for plumbing?

Who says you don't need math? Here are several math concepts needed for welding, plumbing and piping. |

## 2. Microsoft Mathematics 4.0 - now for $0

MS Math 4.0 is a complimentary offering from Microsoft - and it's not bad. |

## 3. Singapore dollar - backed by gold

Once debt starts to spiral out of control, there's not much you can do. Here's one country that's in a healthy position. |

## 4. Friday math movies

## (a) The Rice Show

Using the scale of one grain of rice to one person, The Rice Show represents population statistics in a way you’ve never seen before. |

## (b) The surprising math of cities and corporations

This video discusses some of the reasons – and solutions – for global warming. It’s all about scaling. Friday math movie: The surprising math of cities and corporations |

## 5. Poll results

The poll in Jul/Aug 2011 asked readers: "How many computers are used in your math classroom?".

The answer "none" is surprisingly high. Most math curriculums are still very conservative.

None

62%

Most students use one.

20%

One

12%

Two

6%

**Current poll: **The latest poll asks if you "friend" your teacher (or students) on Facebook. You can respond on any page in Interactive Mathematics.

## 6. Puzzles

Last Newsletter I posed this question:

"My husband's age," remarked a lady the other day, "is represented by the figures of my own age reversed. He is my senior, and the difference between our ages is one-eleventh of their sum." How old are they?

Two readers (Bevan and VT) responded with the correct answer of 45 and 54.

**New puzzle: **

If the end of the world should come on the first day of a new century, what is the probability that it will happen on a Sunday?

## 7. Final thought: Shaping our lives

Anthony Robbins is an authority on leadership and peak performance. He also runs a non-profit Foundation helping inner-city youth, senior citizens and the homeless.

I felt this was a great quote - it applies to learning math, too!

It's not what we do once in a while that shapes our lives. It's what we do consistently. [Anthony Robbins]

Until next time, enjoy whatever you learn.

See the 2 Comments below.

24 Aug 2011 at 4:19 am [Comment permalink]

If the end of the world should come on the first day of a new century, what is the probability that it will happen on a Sunday?

There are 7 days in a week. So, no. elements in the sample space is 7. There is one Sunday in a week. Hence the probability that it will happen on a Sunday is 1/7.

24 Aug 2011 at 1:54 pm [Comment permalink]

@P M. Your answer would appear to be correct, but sorry, it isn't!