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.
Favorites
Browse the Brain Boosters Gallery

 

  Number & Math Play

Found and Lost
 
Q Eleanor found $4. Putting that $4 together with the money she had before her good luck, she now had 5 times the amount of money she would have had if she had lost $4. How much money did Eleanor have before she found the $4?


 
A Before Eleanor found the $4, she had $6. If she had lost $4 from the $6, she would have had only $2 left. The $4 she found plus the $6 she already had means she now has $10, which if 5 times the $2 should would have had if she had lost $4 instead of finding $4.

STRATEGY: Guess and check.

Source: Inspired by a puzzle in Put on Your Thinking Cap, Helen Jill Fletcher. New York: Abelard-Schuman, 1968.