What powerful mathematical tool do you use everyday? If you have ever considered how much food you can eat and still leave room for dessert, or made a rough calculation of how long it will take to travel to school, you are using estimates to help guide and inform your decisions.
PUMAS:the Online Journal of Math and Science Examples for Pre-College Education
Practical Uses of Math and Science (PUMAS)
Frolking S, Rosentrater L. 1999. Two answers are better than one. PUMAS (Practical Uses of Math and Science). The On-line Journal of Math and Science Examples for Pre-College Education, http://pumas.jpl.nasa.gov.