It’s Halloween and this is your neighborhood. How long will it take you to trick or treat at every house in your neighborhood? Possible conversation with students: How long will it take you to get from house to house? You…

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# Macy’s Thanksgiving Day parade

Students study a map of the Macy’s Thanksgiving Day parade, describe, measure and hypothesize why this route was chosen. Then they calculate how long each band will be marching and what time they will arrive at the finish. Students…

# Triple Crown, 2014

Victor Espinoza riding California Chrome The Kentucky Derby was just run. May 17th will be the running of the Preakness horse race. The Preakness is the second race of the Triple Crown. Will California Chrome win the Preakness too and get a chance…

# Who had the greatest NBA season ever?

Some of the greats; Larry Bird, Michael Jordan, Magic Johnson Another NBA regular season has wrapped up. Kevin Durant had a terrific year with great offensive production. Who had the greatest NBA season of all time? Which player contributed the…

# Negative Exponents? Ugh

This activity/post is a little different than are usual posts. We look at a particular math concept and consider how to use context, models and CCSS math practices to increase student understanding. This activity focuses on negative exponents. Even if you…

# Cost of a gallon of gas

In 1950, one gallon of gasoline costs $0.27. Today the prices are going down but are they as low as they were in 1950? Or could $0.27 buy more in 1950? In this activity we begin to understand the relative…

# Cost of light bulbs – New and improved

There’s a lot of misinformation out there about the cost to consumers of CFL and LED bulbs and the savings in energy and money that could be realized. Let your students “do the math” and realize some of the profit…

# Bits, bytes, and nibbles

Clicking on the image will show it larger. I’m not very good at understanding how large my device capacities are and how big the files that I want to download are in comparison. I decided to practice with the numbers…

# Big Burger

Time to treat the kids to ratios, proportions, fractions and BIG BURGERS! In this activity students explore the ratio of the various ingredients in the world’s largest burger (pictured above & in the video below). Students apply this ratio of ingredients to…

# Legos

Act One: The world record for the tallest structure made of Legos was recently set in Seoul, South Korea. Check out the pictures and video below: How much do you estimate that it costs for only the materials, to build this tower?

# How much do we spend on Mother’s Day?

Image from Trendhunter.com Here is a Mother’s Day Infographic from 2012. Use the Mother’s Day event to engage your students in approximating, reasoning, and investigating. Brian has asked students to estimate how much is spent in the United States for…

# Halloween Booritos again this year!

One of my favorite foods is a burrito. One of my favorite places to get a burrito is Chipotle. Their food is delicious and environmentally friendly. For Halloween 2014, Chipotle is running the following promotion and charity drive. Chipotle is offering…

# Never-ending pasta

On September 8, 2014, Olive Garden offered a $100 pass for never-ending pasta and Coca Cola soft drinks. The 1,000 patrons who quickly bought up the passes will be entitled to as much pasta as they like (with toppings) from…

# Cruising

There have been a lot of cruise ship mishaps and disasters this year. While these are in the news, let your students consider how these floating cities manage their resources and which of their needs are precarious as they calculate…

# Bank of America Debit Card Fees

Millions of people and businesses use debit cards every day. Banks didn’t charge customers for their use. Banks actually gave rewards and incentives to customers for using them. So how did banks make money from debit cards? Banks charged the…