Puzzlemaker Clip Art Gallery Lesson Plan Library Kathy Schrock's Guide for Educators Brain Boosters Learning Adventures Science Fair Central Curriculum Center On TV Young Scientist Challenge Enter Username Access resources you have created under your login. Teacher Tools such as: Lesson Plan Creator, Quiz Builder, and Worksheet Generator are no longer available. You can create new lesson plans and quizzes within your DE streaming account. If you don't have an account, sign up for a demo here.

Number & Math Play How Many Students?   A new school has opened with fewer than 500 students. One-third of the students is a whole number. So are one-fourth, one-fifth, and one-seventh of the students. How many students go to this school?   420 students: This is the only number under 500 that can be divided evenly by 3, 4, 5, and 7. STRATEGY: Make a list. Source: http://www.brainteasers.net, August 27, 2000.

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