## Will one roll be enough?

Students can use the man or the basket as a reference as they try to approximate the size of these gifts and how much wrapping paper will actually be needed. Approximation, surface area, reasoning explanation, and diagraming!

An X-box is added to the mix and students are given the size of roll of wrapping paper.  Do they have enough?

## Holiday shipping

Now that the shopping season has begun, it's time to get the packages to your homes.  Two big companies take care of a lot of that shipping.  How do they manage that?

The mechanisms for these two shipping giants are huge. Did you ever wonder how they pull it off?  To me they both seem to do a great job.  Is that consistently true.  What are the numbers like?

(Teachers might start this lesson by asking kids to predict what percent of holiday gifts are delivered on time and what percent are not?)

## What can you tell about a snowflake?

Clicking on this image will show it larger in a new window.

As a snowflake falls from the sky, its crystal grows according to the humidity and temperatures of the air that it passes through.

In this activity, students interpret a graphic that clarifies that growth and try to deduce what conditions various flakes moved through as they fell.

The activity finishes with the creation of a possibly accurate, six-pointed paper snowflake. These could be winter decorations for your classroom.

The activity: Snowflakes.pdf

## Wrapping presents on the diagonal

Dr. Sara Santos is a popular mathematician and speaker on mathematics.  She has worked out a method for wrapping boxes (rectangular prisms) as efficiently as possible. (Watch the video above)  Her method was written up in this article in Mental Floss and she was interviewed about her wrapping paper method in this video clip from The One Show.

In this activity students determine if this method for minimizing wrapping paper is actually more efficient then the traditional method.   For a hands on learning experiment, have students actually wrap a small rectangular prism using any available paper in both the traditional and diagonal methods. Then let them compare the two quantities of wrapping paper and decide which method uses less paper and by what percent.

## Wind chill

The weather forecasters tell us what the wind chill temperature will feel like. How do they figure out that number?

Dudley on a cold and windy day.

In this activity students use the National Weather System chart to gauge wind chill, examine the patterns that correlate increasing wind and/or decreasing temperatures, use wind chill numbers to estimate possible wind and temperature factors, and generally become familiar with this sort of interpolation and calculation.  Also check out this windchill calculator, which you can use to quickly find the windchill for a given temperature and wind speed.

The activity:  WindChill.pdf

## Hanukkah is almost here!

Egad, Hanukkah begins this year on Sunday evening, November 28th. I think it was in December last year. Why isn't it always on the same date? Students look at the Hebrew calendar and appreciate the incredible mathematics involved in creating a calendar that aligns both the moon's revolution about the Earth and the Earth's revolution about the Sun.

The activity: hebrew-calendar2021.pdf