This online activity offers students the opportunity to reason with numbers as they examine the practical implications of sun protection factor (SPF) numbers on sunblock. The activity is part of the Figure This! collection of 80 online mathematical challenges emphasizing real-world uses of mathematics. In this activity, the Hint and Getting Started sections illustrate how to apply mathematical reasoning. They demonstrate how to think through the answer to the initial question about how a person using sunblock could burn after being in the sun for only one hour. In similar activity questions, the student determines cooking time for a baked potato and the time required to fill a pool. The activity includes information and web links addressing the hazards of overexposure to the sun. Copyright 2005 Eisenhower National Clearinghouse


  • Mathematics > General
  • Education > General

Education Levels:

  • Grade 1
  • Grade 2
  • Grade 3
  • Grade 4
  • Grade 5
  • Grade 6
  • Grade 7
  • Grade 8
  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


Fractions,Process skills,Number and operations,Middle School,NSDL,Grade 8,NSDL_SetSpec_1007936,oai:nsdl.org:2200/20120114184701604T,Grade 6,Problem solving,Informal Education,Mathematics,Education,Reasoning,Arithmetic,Grade 7



Access Privileges:

Public - Available to anyone

License Deed:

Creative Commons Attribution Non-Commercial Share Alike


This resource has not yet been aligned.
Curriki Rating
'NR' - This resource has not been rated
'NR' - This resource has not been rated

This resource has not yet been reviewed.

Not Rated Yet.

Non-profit Tax ID # 203478467