File:9-Multiples Explanation.jpg
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Description9-Multiples Explanation.jpg |
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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:25, 9 August 2022 | 1,304 × 1,851 (284 KB) | GregWelch8 (talk | contribs) | Uploaded own work with UploadWizard |
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Date and time of data generation | 03:13, 9 September 2021 |
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Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 03:15, 9 September 2021 |
Date and time of digitizing | 03:13, 9 September 2021 |
DateTimeOriginal subseconds | 24 |
DateTimeDigitized subseconds | 24 |
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