File:9-Multiples Explanation.jpg

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Captions

Captions

9-Multiples = Back1 & Make10

Summary[edit]

Description
English: Nine is unique in that it is the only digit for which the multiples change by one for both the ten’s and the one's place.  This enabled the development of lots of tricks/methods to calculate the 9s.  This is the simplest. It uses only ONE number. ONE number stays in the brain's 'register' for two of the easiest operations in math.  Also, it is based on Make10.  Make10 is a FOUNDATIONAL math skill that we WANT students to practice (not using their hands).  There are dozens of Make-10 exercises.  This one is easier than most (since there is no remainder) AND it results in students learning the 9s.  The calculation is so fast that memorization is no longer necessary.  It takes less than a minute to teach to a student that knows Make10. Just add a simple count back.
Date
Source Own work
Author GregWelch8

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current13:25, 9 August 2022Thumbnail for version as of 13:25, 9 August 20221,304 × 1,851 (284 KB)GregWelch8 (talk | contribs)Uploaded own work with UploadWizard

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