Tips for presenting with a chalkboard/whiteboard?

I’d like to start a discussion on good blackboard technique when giving presentations.

What are some aspects of a good and bad lecture – focusing on blackboard technique?

How do you decide what needs to be written and what can just be said?

I assume you want to write enough on the board so people can at least vaguely follow by glancing at the board, but you also don’t to write too much or else you’ll spend too long writing. How do you deal with this balance?

In a similar vein, how much mathematical short hand do you use? Things such as ‘there exists’ and ‘for all’ and ‘such that’ symbols. How much is too much?

What’s the best advice you’ve received about giving talks?

What do you prefer, whiteboards or blackboards?

I find it hard writing with chalk on the lower part of the board without crouching down a lot, any advice on good chalk technique?

submitted by Nevin Manimala Nevin Manimala /u/DoveMot
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99 Cadillac Eldorado – Hissing sound coming from engine. Please help!

Hello everyone!

My 99 Cadillac Eldorado is making a loud hissing sound from the engine by the serpentine belt and the power steering reservoir it stops and starts and then it gets louder and constant while driving. I haven’t been able to find any other person with the same problem. You can clearly hear it in the video linked. Any help would be appreciated! Thank you all!


A quick note: – No check engine light – Idles smoothly and at a constant rpm – AC works fine – No sounds when steering – All fluid levels good – Nothing looks disconnected or loose

submitted by Nevin Manimala Nevin Manimala /u/drvox1600
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ANCOVA and a violation of Levene’s.

Hi all,

I have a dataset with 573 cases, split across 4 groups (N = 149, 144, 141, 139). I ran an ANCOVA with 4 different dependent measures, controlling with 2 covariate variables (so, 4 ANCOVA analyses in total).

All data for each dependent measure, for each group, was normally distributed for ANOVA (within Skew = |1.5|; Kurt. = |3.0|). Homogeneity of regression slopes were not violated, when testing via an interaction hypothesis, however, my Levene’s test was violated for each dependent measure.

Where do I go from here? I understand that you have to do another analysis, but that is only if you also violate the regressions slopes, which I haven’t.

Any help would be fantastic, either advice or a link to an external source.

Cheers in advance 🙂

submitted by Nevin Manimala Nevin Manimala /u/woooookey
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Help! Crowdsourcing and Curriculum and Couplets, Oh My!

I had this kinda random thought one day:

If everyone in the US submitted one problem set, grades 6-12, we’d have enough problems to last us a rather long time.

But pure problem sets are often boring. Perhaps couplets? Here are the first few of mine. (feel free to use them)

“Math Couplets:”

Why? To show math is divine

With minimal use rhymes and lines.


These guys are often reset

For every problem you get:

A letter we wisely choose

To hold the place for a value.


An expression’s a bunch of math you see

With no equal sign nor inequality.


Equations are easy to define!

Two expressions connected by an equal sign.


The question: What is x^2 – x + 2?

If x = 3, here’s what you do:

“capture” each x with parentheses

and replace the x with the 3.

(3)^2 – (3) + 2? Yes, looks great!

9 – 3 + 2 is 8.

Tougher: What’s x + 3 + x + 3 + 4

If you know x + 3 = 5 then score!

We replace for all “x + 3″‘s seen

With a 5. 5 + 5 + 4 is 14.

“Distributive Property:”

Grant’s face is on the fifty

And our use, here, of distribution is nifty!

We have two piles: 7 Grants and 4 more.

The 2 ways to total we will now explore.

Just multiply 50 by the total of bills 11

OR sum 50 x 4 and 50 x 7.

a(b + c) = ab + ac

[“a times b plus c is a b plus a c”]

Is what you need to know to get $550.




Feel free (in fact please) reply with your own poem(s) grades 6 through 12 (and beyond). Use that brain and spend 5-10 minutes making some couplets! Some student(s) down the line will likely appreciate it.

The goal: Poetic crowdsourcing for funner and cooler math. 🙂

— Forgets

submitted by Nevin Manimala Nevin Manimala /u/forgetsID
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