Mathematicians need to know that not all numbers are rational. We approximate irrational number with rational numbers. That is why a calculator may be misleading. This task give learners an opportunity to see how rounding a number and...

Subtracting fractions that have unequal denominators is a tricky process. The activity utilizes fraction bars as a manipulative, in order to understand subtracting fractions and estimating differences. After completing three activities...

Via the concrete setting of estimating the population of the US, your algebra learners are introduced to a logistic growth model. Comparing and contrasting logistic, exponential, linear and quadratic models, to see which fits the data...

Hooray for chocolate chip cookies! Ask your mathematicians to triple a chocolate chip cookie recipe and then reduce the recipe by one-fourth. Your class may need two days to complete, tripling the recipe the first day and reducing the...

An exercise in finding the approximate time that a name would be called at a graduation. Estimating time may be difficult for some of the class, so this resource would not be a good choice for learning this standard. It does end with a...

To compare how the Spanish, French, and English approached the exploration of North America, class groups examine primary source documents and become experts on one of four explorers: Francisco Coronado, Robert LaSalle, Samuel de...

A rich and well-designed activity on estimation is here for you. The activity utilizes a video; ITV Series: The Eddie Files 'Estimation: Going to the Dogs,' along with many websites. Several fantastic learning activities are...

Your young physicists analyze the forms of four equivalent exponential expressions representing an amount of a radioactive material in a substance. They show how each expression is equivalent to the others and what aspects of the decay...