David Marain

@dmarain

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

NJ USA
Vrijeme pridruživanja: veljača 2010.

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  1. Prikvačeni tweet
    24. sij 2019.
    Odgovor korisniku/ci

    It's a tragedy when any child is killed but denying facts to further your narrative is destroying this nation and must be challenged EVERY TIME.

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  2. 30. sij

    . After students have been exposed to some combinatorial thinking some might ask if the formula 3•C(4,2) works! Generalizable? I'm very sure that you could share several other strategies! 😍

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  3. 30. sij

    . This "simple" problem is accessible to all but more importantly shows that mathematics is truly a way of thinking. Systematic counting/combinatorics reveal the underlying beauty of this question.

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  4. 26. sij

    . Not a mathematical fact about zero but I am also curious about people whose names are Zero like Zero Mostel. But also this...

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  5. 26. sij

    . ONE may be the loneliest number but Zero has self-esteem issues too! Pls reply with 2^0 math fact about 0 to cheer it up. By the way I encourage parents and teachers of young children to consider the book below...

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  6. 25. sij

    . Asked 12- & a 22-yr old if more #'s betw 0 & 1 or more #'s > 1 & why. One said, "betw", the other "greater". Yes, I was purposely vague and omitted "same amount". Guess who picked what and why! Comments? Pls RT if you like.

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  7. 23. sij

    . This tweet will be expanded later on my blog MathNotations! I chose a well-known problem about sum_product of 2 #'s to focus on the art and science of developing conceptual reasoning.

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  8. 23. sij

    . Sum of 3 & 2? Product? "The prod of 2 numbers is always greater than their sum" Ex that support; contradict Revise Conjecture. So 2,2 and 0,0 are only prs that make =? Discuss! Check 3 and 1.4? Ideas?

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  9. 21. sij

    . Presh Talwalkar's outstanding YouTube channel "MindYourDecisions" uses technology and brilliantly lucid explanations. I just watched this one:

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  10. 21. sij

    . Actually, we know your loyal assistants will filter "objectionable content!" People like you are the reason for people like Greta.

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  11. 19. sij

    , 7^3-3^5=100 Let's check this by overcomplication! 7^3-3^5=[3•(2+1/3)]³-3^5 =3³(2+1/3)³-3^5 = 3³[(2+1/3)³-3²] 27[2³+3•2²•(1/3)¹+3•2¹(1/3)²+(1/3)³ -9] = 27[8+4+2/3-9] =27(3+2/3)=82+19=100 Pure silliness? Now use logs!😍

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  12. 19. sij

    . In order for the American people to believe that justice has been served and there is no cover-up, I strongly urge you to open up the Senate trial to the public via CNBC. Many Americans feel the same regardless of their political bent.

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  13. 19. sij

    If you feel that some of my problems are unrealistic for the ages listed, I've used similar problems in classes over 40 years. I adapted them for each group but I never said to myself that this is too much of a stretch. Developing minds require extending their reach!

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  14. 19. sij

    . Thanks For PreAlg, Alg 1,Alg2? Modify as needed for each group? Some would say this isn't a real world problem. I would argue that powers and how to manipulate them is a vital skill today! Pls focus on the HOW rather than the WHAT of these problems?

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  15. 19. sij

    . What skills needed for... Define G as 1 followed by 100 zeros (A) Write G as a power of 10; 100; 100000 (B) G+G= (I) 10^200? (II) 20^100? (III) 2•10^100? (C) Write as a power of 10: G+G+...+G I. 100 terms II. 1000 terms III. G terms

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  16. 12. sij

    . n.....Sum......... Even...Odd... Prime 1 1=1 ✔️ 2 1+2=3 ✔️ ✔️ 3 1+2+3=6 ✔️ 4 1+2+3+4=10 ✔️ (a) Complete thru row 10 (b) Make ≥ 4 hypoth. Explain

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  17. 7. sij

    . Interesting perspective. Coding can be taught very early, however it doesn't replace basic skill-building and other math content. But it does strongly complement curriculum and is highly motivational!

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  18. proslijedio/la je Tweet
    Odgovor korisniku/ci

    Wow one shot

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  19. 22. pro 2019.

    . I may post further discussion of this problem and teaching strategies on my blog: I'll tweet when it's there! Happy Holidays! 😍

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  20. 22. pro 2019.

    . Accessible to most students, some may need a hint. Happy Holidays to all.

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  21. proslijedio/la je Tweet

    RETWEET if you want Pelosi to hold the articles until Mitch agrees to a real trial

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