Geometry of Flooding

In 2010, March was so rainy that flooding was the topic of every newscast and many, many conversations.  The picture shows how students went home from school in Wayland Mass. on March 31st - on a Duckboat.

This two page investigation asks students to calculate the volume of water generated by inches of rain spread over the surface area of Massachusetts. Specific river catchment areas are then considered to understand the actual voluminous rise of the Sudbury River. Once the volume of water is calculated, students are asked to find approximate river depth change.  This activity could be used in any science or math class, especially if flooding in in the news in your area or nationally.


CCSS: 5.MD, 6.G, 6.EE, 6.RP, 7.G, 7.RP, HSG, HSF

For members we have an editable Word docx and solutions.

Geometry-of-flooding.docx       Geometry-of-flooding-solution.pdf

Two to the … s


Let your students practice exponents, fractional exponents, and roots with this powerful assignment that asks them to compute impressive mathematics in their heads.

If you list the values of various 2 to the ... s

     2^8 = 256
     2^{12} = 4,096
     2^{14} = 16,384
     2^{20} = 1,048,576
     2^{28} = 268,435,456

then you can ask students to calculate all kinds of amazing math in their heads.  It's like magic!


\displaystyle \frac {1,048,576}{4,096}

or   \sqrt {268,435,456}


For members we have an editable Word doc and solutions.

two-to-thes2.doc       two-to-thes2-solution.pdf

Quadratic formula on your calculator

You can program your TI calculator so that a quadratic equations can be solved quickly by just plugging the X ² coefficient, the X coefficient, and the constant into your calculator.

Arrange your equation in this form:

AX² + BX + C = 0

Program your calculator according to the following directions.

And you are all set to solve.