Ratio and Proportion

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Eliud Kipchoge runs marathon in 1:59:40.2

Algebra Sports Ratio and Proportion Data and probability
  Eliud Kipchoge breaks 2 hour marathon barrier.   On October 12th 2019, Eliud Kipchoge ran a marathon in Vienna in under 2 hours. He has now broken a barrier of what humans are c...

When will he use up his chocolate milk account?

Algebra Number Sense Math and Food Ratio and Proportion
  Brian's son buys chocolate milk every few days to go with his lunch. His school creates an invoice that they send to parents every month that show the status of his milk account. Brian p...

Drill bit fractions

Number Sense Ratio and Proportion 3-act tasks
Act One:  Drill bits are measured by the diameter of the bit in inches. The drill bits below are ordered left to right in increasing size. The numerators in the fractions have been black...

Who's going back to school?

Algebra Number Sense Math and Social Studies Ratio and Proportion Data and probability
Students look at the past and present populations of the U.S. and the past and present population of school attendees to calculate the percentage of the population that are enrolled in K-12 school...

Louisiana

Algebra Number Sense Math and Science Math and Social Studies Current events Ratio and Proportion
We recently watched the approach of Hurricane Barry and worried about the fate of Louisiana. After the devastation of Hurricane Katrina, what would another powerful hurricane do to this fragile ...

How can Nike give away so much great stuff?

Algebra Number Sense Sports Ratio and Proportion Data and probability
Worldwide Nike supports many teams and athletes.  They design, manufacture, and supply gear for almost every sport imaginable. How much are those give-aways worth?  Is the company going ...

NHL Playoff games can sure last a long time!

Algebra Number Sense Sports Ratio and Proportion Data and probability
Revised! We're watching another Stanley Cup playoff now. Will there be any really long games during the playoffs? In 2013, a Stanley Cup playoff match between the Bruins and Blackhawks wen...

Tornadoes 2019

Number Sense Math and Science Ratio and Proportion Data and probability
Tornadoes have devastated the Midwest, U.S. in the last few days. Alabama, Texas, Louisiana, Oklahoma, Ohio, Missouri, Iowa, Nebraska and Mississippi have been brutally hit with these powerful event...

Wow, everything must be free!

Algebra Number Sense Ratio and Proportion Data and probability
What happens when you take 50% off again after taking 50% off at first? Students examine this retailer trick of giving double discounts.  What happens to the price when you are given...

Huge Key Lime pie

Number Sense Geometry Math and Food Ratio and Proportion
More for π Day!   On a cold and snowy day in Boston, two chefs created a huge Key Lime pie to remind the frozen people of the Northeast how tasty and warm the Keys of Florida are. ...
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