Multiples of Nine.

Here is a website that is worth checking out.

> http://www.regiftable.com/RegiftingRobinPopUp.html

You are asked to pick a 2 digit number and then subtract those 2 digits from your number. ex. you choose 48 and subtract 4 and 8 from it. Your number is 36

You then find your number on a page of numbers and a matching gift.

The computer then tells you the exact gift you chose.

How?

Have the class solve the problem. Have each student choose a number and subtract the two digits. List the numbers.

36, 45, 81, 18, 27

Do you see a pattern?

3+6, 4+5, 8+1

Now take a second look at the gift page. What is listed for 9, 18, 27, 36....?

## Monday, February 23, 2009

## Wednesday, February 11, 2009

### February Update.

Hi, Hope everyone is doing well.

I have been working on a couple math topics that I hope you will find useful.

Symmetry

In math I have added a symmetry page that has a number of activities for different grade levels. I had some help from the Grade 6 class at Petite.

T Rex Math

I have reworked the TRex math page. I really think that counting in Base 4 or Base 2 exercises will help students who are having difficulty with Base 10.

Google Earth

While working on the area and perimeter page I stumble on a short Youtube video on using Google Earth. Find your school or a large building on Google Earth and then Tools, select your unit of measurement and you can get the dimensions of the building.

Science Shorts

A couple of things in science. February 12 is Darwin's birthday. On my Schedule page you can link to a free Gizmo that shows how climate change can effect the shape of a bird's beak.

We haven't had to many clear evenings but the planet Venus continues to dominate the early evening sky.

Remember to check the Science News. It is updated weekly.

Thanks for your time,

John

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