@dmarain

Retired Math Educator/Blogger/Math Consultant/Math Assessment Specialist; I also have a problem with crimes against humanity

 NJ USA
Joined February 2010
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884Media
substack.com/@davemathnotati…
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They Struggled With Math. Then They Challenged My AP Calculus Students davesmathnotations.substack.…
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The Sum of Every Arrangement of 1234 (And Why You Don’t Have to Add Them) davesmathnotations.substack.…
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Exactly One or At Least One? A Three-Digit Counting Challenge davesmathnotations.substack.…
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YOU HAVE 30 SECONDS TO ANSWER THIS COUNTING QUESTION! substack.com/@davemathnotati…
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Sorry, I left out the link! Here it is: davesmathnotations.substack.…
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In base 10, 1001 is divisible by 11. EXPLAIN WHY 1001 (base b) is always divisible by 11 (base b). Assume 2≤b≤10. Express the quotient in base b. davesmathnotations.substack.…
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No Pizza Today. Just Connect the Dots! davesmathnotations.substack.…
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David Marain retweeted
The Epoch Times
@EpochTimesOct 1
🚨Gabapentin: The Controversial Drug Doctors Are Prescribing Read more

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Slicing a Pizza with Chords: How Many Pieces? davesmathnotations.substack.…
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MAGNIFYING THE LENS davesmathnotations.substack.…
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If 1.8(28) + 32 = 82.4, then 1.8(29) + 32 = ? davesmathnotations.substack.…
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36 + 64 = 100 So?davesmathnotations.substack.…
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WHY IS (1+2+3+4+5)² - (1+2+3+4)² = 5³ ? davesmathnotations.substack.…
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Five Different Odd Digits — One Product davesmathnotations.substack.…
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Exactly Four Factors davesmathnotations.substack.…
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Thanks, JONATHAN I miss your contributions! Questions like yours are addressed in the full Substack post for free/paid subscribers where I show possible extensions. Hope you are well😊
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[For Free or Paid Subscribers) Detailed Solution and More for Cross-Sectional Areas! davesmathnotations.substack.…
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davesmathnotations.substack.…
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