Q&A #17575

Doubling single digit numbers

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From: Candace <casmothers@charter.net>
To: Teacher2Teacher Service
Date: Sep 13, 2006 at 10:29:21
Subject: Doubling single digit numbers

Why do elementary students easily remember the doubled numbers (2+2=4 to 
9+9=18) when they may have trouble with learning and remembering the 
other addition facts?

I have searched the internet, books, white papers, etc., but have 
found no solid reason or research as to how or why young children 
seem to learn the doubling of single digit numbers almost 

I am working on a system of learning techniques for basic addition 
facts to help children not only learn but remember these facts. I 
have techniques for learning/recalling the other facts but the 
doubling seems to be an anomaly or is simply assumed. I was hoping 
you might be able to shed some light on this for me.

I sent the above information to the mathforum and Doctor Free sent the 
following reply.

Hello Candice,

I'm not aware of any research, but you might consider asking about
this at our Teacher2Teacher site,


where they might know more about that. 

Having said that, I might be able to shed some light on it.

In my minds eye I can SEE two THINGS (even if they are NUMBERS).
I handle pairs of things every day - two hands, feet, legs, eyes.
So my brain is skilled at it!

If I loved horses, or cats, dogs, rabbits, I might be good at
quadrupling.  We are good at what INTERESTS us!

Good luck with your efforts to interesting children in ways of 
seeing things.

- Doctor Free, The Math Forum

If anyone knows of documented research or data about this, I would love 
to hear from you. Thanks. Candace 

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