Cycle 3 sol. gr. 2

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Article #307

#307

From: Jeff Harrits
Date: Wed, 16 Dec 1992 16:28

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TAS Kids % Anne Hecht
Taipei American School
800 Chungshan Rd, N., Sec. 6, Taipei, Taiwan, R.O.C.

Solutions to the Mathmagic Problems, Cycle 3, 2nd 2nd Grade; Ms MottiÕs Class; Grace Chang; Michelle Chang; Daniel Chen; LawrenceChu; Andrew Dy; Lian Fournier; Pong-pong Hai; Kari Inoue; Kelvin Lee; Elaine Leu; Sami Magoon; Mark Merin; Lela Philbrook; Allison Scott; Ashton Seliger; Michael Tu; Jeffrey Wang; Michelle Wang; Christopher Wu State the Problem:  Edna has 9 pennies and her mother gives her 9 more.  The amount is doubled.  How many pennies does she have now? What we know:  Edna has 9 pennies and g
ets 9 more What we donÕt know:  How many Edna has in all Assumptions:  We assume that doubling means the same as 9+9.

Failed Strategies:  One group said double the nine, but never gave the answer.  One group said count by 2s but never gave the answer.  One group said 9+9=18 so 18+18=36. They thought you had to go on doubling.
SuccessfulStrategies:  One group said 9+9=18, make an equation;  One group said 9 pennies + 9 pennies = 18 pennies.  We liked this better because the answer was labeled.      One group countred on their fingers from 9 to 18.
 We called this using objects.  One group said count real pennies.  One group said a penny is a cent, so 9 pennies is 9 cents, so 9 pennies plus 9 pennies is 18 cents.


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Path: arc1-ca.pugleaf.net!sparky!uunet!psgrain!puddle!f921.n720.z6.fidonet.org!Jeff.Harrits
From: Jeff.Harrits@f921.n720.z6.fidonet.org (Jeff Harrits)
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Subject: Cycle 3 sol.  gr. 2
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Date: Wed, 16 Dec 92 09:28:00 PDT
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