RT @GHSMaths: Up and down. https://t.co/QcmHCPdvET - The Calculator Guide from Twitter

Up and down. http://pic.twitter.com/QcmHCPdvET

— Martin Holtham (@GHSMaths) October 23, 2017

from Twitter https://twitter.com/GuideCalculator

October 24, 2017 at 09:54AM
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