Tag: 5.NBT

Shipping Crunch

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…

Egad! It’s already time for Hanukkah

Sunday evening, December 2nd, is the first night of Hanukkah this year. I think it was much later in December last year. Why isn’t it always on the same date? Students look at the Hebrew calendar and appreciate the incredible…

World Cup rankings

In December soccer teams with the strongest world rankings were chosen to play in the once-every-4-years World Cup. The World Cup competition has just begun and will continue through July 15th. The team rankings are calculated in a pretty complex…

Impress your parents at dinner

This activity is the first in our series on mental math tricks.  Let your students develop their own individual way of mentally multiplying by 0.5, 5, 50, 500, and so on.  We have a little practice and a requirement for…

Mother’s Day is coming up

Mother’s Day by the numbers – Mother’s Day is right around the corner and this means big business for the greeting card and floral industries. Let your students practice averages, percents, and large numbers while they analyze the statistics on Mother’s…

What me? Irrational?

We’ve found that some students believe that the approximation that their calculators show for irrational numbers is exact.  Here’s an activity that you can advertise as long multiplication review. After they study our calculations have a discussion just to clarify…

Hexadecimal coloring

Probably most of us have heard of and even used hexadecimal color codes. Don’t you wonder why their number descriptions really make sense? In this activity we first ask students to color in our Golden Spiral by giving them the…

Is the Iditarod really the Last Great Race on Earth?

The Iditarod Dog Sled Race begins on Saturday, March 4th in Anchorage, Alaska. This long and grueling competition is called the Last Great Race on Earth. Students do some rate, distance, and hardship comparisons to decide if they agree that the…

Is this a Leap year?

Will we have a 29th of February this year?  How can you tell? Students work with a flow chart to deduce what years are going to be leap years.  They learn about the exact measurement of a solar year and…

Winter Olympics, PyeongChang: February 9 – 25

Scoring Ski jumping – The scoring rubric for each of the Olympic events is intended to eliminate the possibility of scoring bias from the judges. Let your students learn more about the scoring of one event and decide whether it seems fair…

Super Bowl numerals, 2018

Super Bowl numbers are appearing again. As students start getting into the current Super Bowl hype, help them to understand the notation that the sports writers and advertisements are using. Introduce Roman numerals to your class.  In this activity students learn…

Proposed southern border wall

You have probably heard about the proposed border wall that may go up along the U.S./Mexico border.  How much wall needs to be built? How much will that cost? What is that per mile? Per foot? What else could you…

What’s wrong with this picture?

We’ve gotten used to believing what we read or see advertised.  But sometimes the clerk doesn’t get the sales discount right or something seems a little off.  Let students ponder this store menu and see if they can figure out…

Flag Art

A little ratio art might be a fun way to get ready for the upcoming Memorial Day holiday.  In this activity students measure; create whole number ratios for the official U.S. flag; decide how our artistic flags will be different…

Which is the best deal?

How do you calculate and justify which deal is a better savings?  By dollars saved?  By percent saved? By some other measure? The activity: WhichDealOffersMostValue.pdf CCSS: 4.OA, 4.NBT, 4.MD.A, 5.NBT, 6.RP, 6.EE, 7.RP, 7.EE.A