# Category: Number Sense

## MAVEN arrives at Mars

Recently the MAVEN spacecraft (Mars Atmosphere and Volatile Evolution Mission) that was launched on November  18, 2013 reached Mars and attained an elongated orbit around the planet.  How does someone figure out how to do that?

## Ebola updated

Ebola has continued to gain strength and devastate regions of West Africa.  WHO (World Health Organization) updates their data frequently and the progress and lack of control of the epidemic is very concerning. We’ve gathered the present numbers again for…

My friend and I were arguing about how long it would take me to double my investment amounts.  How will your students figure this out?  Are there any tricks?  Explore investing and exponential growth as your students discover “The Rule…

## Saffron and paella

In order to cook Paella (a delicious Spanish rice dish) I needed to buy Saffron spice.  It was hugely expensive.  So, I’ve decided to start a business of growing saffron and becoming immensely wealthy.

## The spread of Ebola in West Africa

Ebola is a deadly virus that has reappeared in Western Africa in an outbreak that began in February of this year.  We’ve supplied you with weekly statistics on the progression of this disease and given you and your students a…

## Wheel of Theodorus

Bring a little art into your math class as you begin to use the Pythagorean theorem and your students first meet irrational numbers.

## How many wins is Lebron worth?

Lebron recently left the Miami Heat to go back home to the Cleveland Cavaliers where he began his professional career.  Lebron is arguably the best player in the NBA and a tremendous addition to a team … a real difference…

## Cheesy Goldfish crackers

In this activity students do a little comparison shopping as they determine which size Goldfish product is the best deal.  Students are introduced to the ratio table as a tool for determining equivalent ratios and comparing different rates.  Students graph cost per ounce relationships and answer a…

## Typhoon Neoguri approaching Japan

A powerful typhoon has just passed Okinawa, Japan’s southern-most prefecture, and is expected to continue to be very powerful.  What is a typhoon?  How are they scaled? In this activity students become aware of various storm rankings and severity as they…

## Pizza Deals

Check out the new Flatizza from Subway. If the slice of pizza is from an 18-inch pizza cut into eight pieces, which deal is better when comparing area of pizza and cost?  How does the area of a square pizza…

## Three great World Cup activities

World Cup ranking – Students explore the ranking formulated from each team’s previous 4 years of play in their geographical divisions.  The formula is complex and weighted. Is it fair?  5.OA, 5.NBT, 5.NF.B, 6.NS.B, 6.EE, 6.SP, 7.EE, 8.F, 8.SP, HSA World…

## World Cup – How many ways?

present world cup scores How many games are played in each round of the World Cup?  In the opening round each of the four teams in a group must play each other (round robin format).  From then on each round…

## World Cup draw

This is part II of our reflections on the World Cup games.  Part I, World Cup rankings, explained and let students practice with the formula and weighting that is used to establish each country’s team rank. This second activity deals with…

## California Chrome’s Lineage

Alas.  California Chrome did not win the Triple Crown.  Tonalist won the Belmont Stakes. This Saturday is the final race of the Triple Crown of thoroughbred horse racing … the Belmont Stakes. No horse has won the Triple Crown since…

## World Cup rankings

In December the soccer teams with the strongest world rankings were chosen to play in the once-every-4-years World Cup. The team rankings are calculated in a pretty complex manner. How are the 32 teams selected? Students can explore the ranking…