Doubling and Halving Riddles
Last updated June 25 2013 , created August 02 2011 , viewed 18,275
Exam board: Common Core
A set of twostep riddles to be used to teach the inverse between doubles and halves.I would suggest printing them out on different colors to allow the children to self assess their own ability and try harder ones if they want to challenge themselves! Aligned with Common Core State Standards: 3.OA.1, Operations and Algebraic Thinking.
Adapted from a resource contributed to TES Connect by lydiacook2
Downloads and web links

Instructions for teachers
DoublesHalvesRiddlesAnswer.doc (40kb, Word document) 
for pupils

Activity
DoublesHalvesRiddle.doc (48kb, Word document)
Classification
 Grade 2 / Math / Number and Operations in Base Ten (723)
 Grade 3 / Math / Number and Operations in Base Ten (678)
 Grade 4 / Math / Number and Operations in Base Ten (843)
 Grade 5 / Math / Number and Operations in Base Ten (748)
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Not only is this great for introducing solving equations in prealgebra, as well as a basic algebra review, your activity gave me an idea for developing a similar activity using exponents for my Algebra 2 students! Hopefully, I will get it done and posted before the end of the summer! This interactive activity could easily be converted to an "I have . . . / Who has . . . ?" format as well as a "BINGO" or "Tic Tack Toe" game! :) Thanks for reminding us to keep math practice fun  students don't mind doing repeated practice when it's in a game or team competition format! from MzMathBee, June 24 2013 
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I can see using this with middle school students learning to write algebraic equations and solve them. Very nice  thank you! from cayfreeman, June 12 2013 
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Wow very inspirational for me the pupils will enjoy this activity thanks from BIDEMIBAMIDELE, June 01 2013 
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Great mental math exercise, I will use this as morning seat work! from TleaDennis, May 19 2013 
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this is exactly what I needed. Thank a bizillion!! from bcapwell, October 03 2012 
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